KR930702076A - 폴리에틸렌(pe) 및 폴리프로필렌(pp)의 분리방법 - Google Patents
폴리에틸렌(pe) 및 폴리프로필렌(pp)의 분리방법Info
- Publication number
- KR930702076A KR930702076A KR1019930701176A KR930701176A KR930702076A KR 930702076 A KR930702076 A KR 930702076A KR 1019930701176 A KR1019930701176 A KR 1019930701176A KR 930701176 A KR930701176 A KR 930701176A KR 930702076 A KR930702076 A KR 930702076A
- Authority
- KR
- South Korea
- Prior art keywords
- resin mixture
- mixture
- surface treatment
- alkaline liquid
- inorganic acid
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/003—Pretreatment of the solids prior to electrostatic separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/006—Charging without electricity supply, e.g. by tribo-electricity, pyroelectricity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/02—Separators
- B03C7/12—Separators with material falling free
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0203—Separating plastics from plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0262—Specific separating techniques using electrical caracteristics
- B29B2017/0265—Electrostatic separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0286—Cleaning means used for separation
- B29B2017/0289—Washing the materials in liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/10—Polymers of propylene
- B29K2023/12—PP, i.e. polypropylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
- B29K2711/12—Paper, e.g. cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7544—Injection needles, syringes
-
- 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Materials For Medical Uses (AREA)
- Developing Agents For Electrophotography (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
본 발명은 합성수지 혼합물, 특히 폴리에틸렌 및 폴리프로필렌과 같이 중복된 비중을 갖는 혼합물을 정전기적 방법에 의해 분리시키는 것이며, 이때 혼합물을 충전시키기 전에 표면처리시키는 방법에 관한 것이다.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
Claims (20)
- 마찰전기를 충전시키기 전에 합성수지 혼합물을 표면처리하는 것을 특징으로하여, 자유낙하 분리기에 의한 정전기적 분리방법에 따라, 예를들면 폴리에틸렌(PE) 및 폴리프로필렌(PP)과 같은 중복된 동일 비중범위를 나타내는 각종 화학적 종류의 합성수지 혼합물로 부터 각 합성수지 입자를 분리하는 방법.
- 제1항에 있어서, 상기 표면처리는 합성수지 혼합물을 무기산과 접촉시킴을 특징으로 하는 방법.
- 제1항에 있어서, 상기 표면처리는 합성수지 혼합물을 알칼리액과 접촉시킴을 특징으로 하는 방법.
- 제1항에 있어서, 상기 합성수지 혼합물의 입자크기는 10㎜이하, 바람직하게는 6㎜이하임을 특징으로 하는 방법.
- 제1항에 있어서, 상기 표면처리는 그 실시전에 예를들면, 종이와 같은 이물질을 제거하도록 물로 합성수지 혼합물을 먼저 정제함을 특징으로 하는 방법.
- 제2항, 제3항 및 제5항에 있어서, 알칼리액과 같이 무기산을 정제수에 첨가함을 특징으로 하는 방법.
- 제6항에 있어서, 알칼리액과 같이 무기산을 정제수에 첨가함을 특징으로 하는 방법.
- 제5항, 제6항 또는 제7항에 있어서, 혼합물을, 예를들면 굴곡시이브(sieve) 또는 원심분리기와 같은 탈수장치에 의해 2%이하의 잔류수분 함량으로 건조시킴을 특징으로 하는 방법.
- 제8항에 있어서, 약2%까지 현저히 건조시킨 후 합성수지 혼합물을 70 내지 100℃의 온도에서 5분이상 동안 유지시킴을 특징으로 하는 방법.
- 제9항에 있어서, 열처리후 혼합물 1㎏당 지방산 10 내지 50㎎을 혼합물에 첨가함을 특징으로 하는 방법.
- 제1항에 있어서, 열처리후 혼합물의 마찰전기 충전이 15 내지 50℃, 바람직하게는 20 내지 35℃의 온도 10 내지 40%의 바람직하게는 15 내지 20%의 상대습도에서 수행됨을 특징으로 하는 방법.
- 제2항에 있어서, 무기산으로서 묽은 염산을 선택함을 특징으로 하는 방법.
- 제12항에 있어서, pH값이 약3인 묽은 염산을 선택함을 특징으로 하는 방법.
- 제3항에 있어서, 알칼리액으로서 묽은 탄산나트륨액을 사용함을 특징으로 하는 방법.
- 제14항에 있어서, pH값이 약11 내지 12인 묽은 탄상나트륨액을 사용함을 특징으로 하는 방법.
- 제1항에 있어서, 자유낙하 분리기가 2 내지 3KV/㎝의 전계강도에서 작동함을 특징으로 하는 방법.
- 제1항에 있어서, 마찰전기를 충전시키기 위해 합성수지 혼합물을 유동층 건조기에서 도입함을 특징으로 하는 방법.
- 제1항에 있어서, 합성수지 혼합물을 나선형 스크류에 의해 충분한 거리로 진행시킴을 특징으로 하는 방법.
- 제1항에 있어서, 합성수지 혼합물을 압축공기에 의해 일정한 거리로 진행시킴을 특징으로 하는 방법.
- ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4127574A DE4127574C1 (ko) | 1991-08-21 | 1991-08-21 | |
DEP4127574.8 | 1991-08-21 | ||
PCT/EP1992/001614 WO1993003852A1 (de) | 1991-08-21 | 1992-07-04 | Verfahren zur trennung von polyethylen (pe) und polypropylen (pp) |
Publications (2)
Publication Number | Publication Date |
---|---|
KR930702076A true KR930702076A (ko) | 1993-09-08 |
KR100221218B1 KR100221218B1 (ko) | 1999-09-15 |
Family
ID=6438709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019930701176A KR100221218B1 (ko) | 1991-08-21 | 1992-07-04 | 폴리에틸렌 및 폴리프로필렌의 분리방법 |
Country Status (19)
Country | Link |
---|---|
US (1) | US5370235A (ko) |
EP (1) | EP0553320B1 (ko) |
JP (1) | JPH0815572B2 (ko) |
KR (1) | KR100221218B1 (ko) |
AT (1) | ATE139148T1 (ko) |
AU (1) | AU654578B2 (ko) |
BR (1) | BR9205325A (ko) |
CA (1) | CA2094034C (ko) |
CZ (1) | CZ282226B6 (ko) |
DE (2) | DE4127574C1 (ko) |
DK (1) | DK0553320T3 (ko) |
ES (1) | ES2090670T3 (ko) |
GR (1) | GR3020772T3 (ko) |
HK (1) | HK1006816A1 (ko) |
HU (1) | HU214930B (ko) |
PL (1) | PL168598B1 (ko) |
RU (1) | RU2091223C1 (ko) |
SK (1) | SK279157B6 (ko) |
WO (1) | WO1993003852A1 (ko) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4438704C1 (de) * | 1994-10-29 | 1996-04-04 | Kali & Salz Ag | Röhrenfreifallscheider zur Trennung von Kunststoffgemengen |
BE1011277A3 (fr) * | 1997-07-11 | 1999-07-06 | Solvay | Procede de separation de constituants d'un materiau multitouche. |
CN1312738A (zh) * | 1999-06-11 | 2001-09-12 | 日立造船株式会社 | 塑料分选方法及塑料分选装置 |
DE102008005189A1 (de) | 2008-01-18 | 2009-07-23 | Thomas Reinhardt | Trockenes Trennverfahren für geringanteilige Komponenten in einem Gemisch von Kalirohsalzen |
GB2501625B (en) | 2013-06-19 | 2014-04-16 | Impact Lab Ltd | Ultrasonic NDT inspection system |
DE102013213478A1 (de) | 2013-07-10 | 2015-01-15 | Mtm Plastics Gmbh | Verfahren und Vorrichtung zur Aufbereitung von Kunststoffabfällen |
GB2522599B (en) | 2014-07-27 | 2016-01-27 | Impact Lab Ltd | Process for separating materials |
CN104511369B (zh) * | 2015-01-20 | 2017-02-22 | 中南大学 | 一种废旧混合塑料分离的方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237514B (de) * | 1966-03-11 | 1967-03-30 | Kali Forschungsanstalt Gmbh | Verfahren zur elektrostatischen Aufbereitung von Mineralgemischen |
FR1539876A (fr) * | 1967-08-08 | 1968-09-20 | Prod Chim D Auby Soc D | Procédé et produits de conditionnement pour le triage électrostatique, plus spécialement en lit fluidisé |
NL8000791A (nl) * | 1980-02-08 | 1981-09-01 | Esmil Bv | Werkwijze en inrichting voor het scheiden van papier en kunststoffolie in een zifter. |
DE3035649C2 (de) * | 1980-09-20 | 1983-01-20 | Kali Und Salz Ag, 3500 Kassel | Verfahren zur elektrostatischen Trennung von Kunststoffgemengen |
DE3227874A1 (de) * | 1982-07-26 | 1984-01-26 | Kali Und Salz Ag, 3500 Kassel | Verfahren zur elektrostatischen trennung von papier und kunststoff enthaltenden zerkleinerten gemengen |
DE3233528C1 (de) * | 1982-09-10 | 1984-04-12 | Kali Und Salz Ag, 3500 Kassel | Elektrostatischer Freifallscheider |
US4809854A (en) * | 1987-01-12 | 1989-03-07 | Nelmor Co., Inc. | Flotation apparatus for reclaiming bonded, two-resin articles |
US5268074A (en) * | 1990-03-27 | 1993-12-07 | Advanced Environmental Recycling Technologies, Inc. | Method for recycling polymeric film |
US5118407A (en) * | 1990-10-16 | 1992-06-02 | Devtech Labs, Inc. | Electrostatic separation of plastic materials |
US5115987A (en) * | 1991-02-19 | 1992-05-26 | Mithal Ashish K | Method for separation of beverage bottle components |
DE4127575C1 (ko) * | 1991-08-21 | 1993-03-11 | Kali Und Salz Ag, 3500 Kassel, De | |
US5234110A (en) * | 1992-11-23 | 1993-08-10 | Kobler Ronald W | Polyvinyl chloride-polyethylene terephthalate separation process and product |
-
1991
- 1991-08-21 DE DE4127574A patent/DE4127574C1/de not_active Expired - Lifetime
-
1992
- 1992-07-04 HU HU9301176A patent/HU214930B/hu not_active IP Right Cessation
- 1992-07-04 AT AT92916024T patent/ATE139148T1/de not_active IP Right Cessation
- 1992-07-04 RU RU93050010A patent/RU2091223C1/ru not_active IP Right Cessation
- 1992-07-04 DK DK92916024T patent/DK0553320T3/da active
- 1992-07-04 US US08/039,272 patent/US5370235A/en not_active Expired - Lifetime
- 1992-07-04 CZ CS93669A patent/CZ282226B6/cs not_active IP Right Cessation
- 1992-07-04 EP EP19920916024 patent/EP0553320B1/de not_active Expired - Lifetime
- 1992-07-04 DE DE59206567T patent/DE59206567D1/de not_active Expired - Lifetime
- 1992-07-04 ES ES92916024T patent/ES2090670T3/es not_active Expired - Lifetime
- 1992-07-04 PL PL92298861A patent/PL168598B1/pl unknown
- 1992-07-04 BR BR9205325A patent/BR9205325A/pt not_active IP Right Cessation
- 1992-07-04 WO PCT/EP1992/001614 patent/WO1993003852A1/de active IP Right Grant
- 1992-07-04 KR KR1019930701176A patent/KR100221218B1/ko not_active IP Right Cessation
- 1992-07-04 JP JP50405292A patent/JPH0815572B2/ja not_active Expired - Lifetime
- 1992-07-04 CA CA 2094034 patent/CA2094034C/en not_active Expired - Fee Related
- 1992-07-04 AU AU23446/92A patent/AU654578B2/en not_active Ceased
- 1992-07-04 SK SK515-93A patent/SK279157B6/sk unknown
-
1996
- 1996-08-12 GR GR960402140T patent/GR3020772T3/el unknown
-
1998
- 1998-06-22 HK HK98105941A patent/HK1006816A1/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CA2094034A1 (en) | 1993-02-22 |
HU214930B (hu) | 1998-07-28 |
ES2090670T3 (es) | 1996-10-16 |
SK51593A3 (en) | 1993-08-11 |
AU2344692A (en) | 1993-03-16 |
RU2091223C1 (ru) | 1997-09-27 |
HU9301176D0 (en) | 1993-08-30 |
KR100221218B1 (ko) | 1999-09-15 |
US5370235A (en) | 1994-12-06 |
JPH06502123A (ja) | 1994-03-10 |
SK279157B6 (sk) | 1998-07-08 |
HK1006816A1 (en) | 1999-03-19 |
PL298861A1 (en) | 1993-10-18 |
DK0553320T3 (da) | 1996-11-18 |
WO1993003852A1 (de) | 1993-03-04 |
CZ66993A3 (en) | 1994-01-19 |
ATE139148T1 (de) | 1996-06-15 |
CA2094034C (en) | 2003-06-17 |
DE59206567D1 (de) | 1996-07-18 |
DE4127574C1 (ko) | 1993-03-11 |
GR3020772T3 (en) | 1996-11-30 |
CZ282226B6 (cs) | 1997-06-11 |
BR9205325A (pt) | 1993-11-23 |
EP0553320A1 (de) | 1993-08-04 |
HUT64251A (en) | 1993-12-28 |
AU654578B2 (en) | 1994-11-10 |
PL168598B1 (pl) | 1996-03-29 |
JPH0815572B2 (ja) | 1996-02-21 |
EP0553320B1 (de) | 1996-06-12 |
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