CN1093976A - 用合成的热塑性材料制备成型制品的方法 - Google Patents
用合成的热塑性材料制备成型制品的方法 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/005—Compensating volume or shape change during moulding, in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0029—Cold deforming of thermoplastics material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
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- 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
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- 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
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- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
- B29K2995/0017—Heat stable
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/66—Processes of reshaping and reforming
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/71—Processes of shaping by shrinking
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Abstract
在用合成的热塑性材料,特别是聚烯烃类如聚乙
烯和聚丙烯,制备成型制品的方法中,塑料材料被加
热至达到或超过其软化温度,在此状态下使之成型以
制成成型制品,随后将之冷却到软化温度之下,而且
在热状态下使材料成型提供中间产品,它比最终所要
求的尺寸稍大,只有在其冷却后才将之经材料紧密冷
压使之定形到所要求的最终的尺寸。
Description
本发明涉及用合成的热塑性材料,特别是聚烯烃类,如聚乙烯及聚丙烯,制备成形制品的方法。在此方法中塑料被加热到或超过其软化温度,在此状态下成形,以形成定形的物品,随后冷却到低于其软化温度。
许多用合成的热塑性材料通过注塑、挤塑、加压或其他成型方法制成的塑料部件,在经过一段时间后或在超过温度极限(大大低于其软化温度)时,会有发生变形的倾向,特别是会收缩,即比制造的尺寸缩小了外部尺寸。例如,用黑聚乙烯制的管子在户外存放一段时间后会显示某些收缩,其数量级可能是1个或几个毫米或其外径的百分之几。虽然管端插口的成型温度或软化温度常常在120至200℃的范围内,严格的成型操作大约在110℃,而且黑管子不可能经日光照射被加热到超过70℃,而这种收缩却实际上发生了。这是不希望发生的,因为这种收缩会对可达到的流速产生不利的影响,也不利于管子间的联接,因为在某些收缩后,不能再作常规的插口联接,或因管端插口会收缩而使内径小于要接上去的管子相应的外径。管端插口内径在制造上的公差为±0.5毫米,而上述收缩将大大超过该值。许多其它的塑料部件也遇到类似的缺点,如一些零配件,它们也是用聚烯烃类热成型的。
以前要用昂贵的制造方法来制造抗收缩的插口。上述已知的方法之一是另外单独用注塑机制插口,随后用一台单独的设备焊接到挤塑成型的管子上去。此方法很昂贵,而且在联接处留下一道看得见的焊缝,材料的氧化提高了泄漏的危险性及插口在焊接处分离的危险性,而且因为甚至插口是用注塑法制成的也会收缩,例如,在阳光照射下,如果它是用某种材料制的。所以这种方法不能提供足够的安全性。另一种已知的方法也有类似的缺点,在此方法中用一台单独的注塑设备将插口注塑于管端,这个方法包括更高的结构费用,因为用了昂贵的机器,而且管子和插口不能构成均匀的整体。
某些合成的塑料材料的收缩,特别是聚烯烃类的收缩,可以解释如下:
聚烯烃类具有结晶结构,而且仅以两种物理状态存在,即固态和液态。在将塑料材料加热时,原始的分子中的一部份仍保持为固态,而另一部份液化了,使得作为其结果的物体能塑性形变,能成型及变形。那些未被液化而仍保持为固态的分子产生所谓的记忆效应,一俟由于温度升高或长时间的蠕变的结果,以前液化了的分子(就是由于它们而使成形的物体维持现在的形状)允许恢复原来的形状时,固态分子的记忆效应就会立刻趋向于使由毛坯制成的物体恢复到最初的形状。可以理解,记忆效应也将依可能存在的填料的性质和用量而定。挤塑成型的管子也会遇到记忆效应,特别是经过扩张的末端插口更为明显,这种效应被认为是造成管子和末端插口收缩的主要原因。由上述材料制成的其它的塑料制品的收缩也有同样的原因。
本发明的目的是提供一种简单的方法,用这种方法可以避免合成塑料材料成形制品的最终的尺寸和指定尺寸的不希望的偏差。一个特别有兴趣的部份目的是允许应用此方法以制造塑料管子及塑料管的扩大的末端插口。
依据本发明的方法的主要特点是:材料在热的状态下成型以产生中间产物,它比最终所要求的尺寸稍大,仅在冷却之后,通过材料紧密冷压工序使之具有最终所要求的尺寸。
用这种简单的措施,满意地达到了预定的目的。可以理解,几个方法步骤必须与材料及加工条件相适应。上述的加工条件,特别是:加工温度(温度决定保持为固态的分子的数目,而这决定其记忆效应)以及材料的性质及其厚度,例如管子壁的厚度。同时必须注意的是,冷压工序的结果是成形制品的压紧而不要发生材料的破裂或断裂。由于塑料制品通常是成批生产的,对每一种成型制品只要做少量的实验就可以准确地限定出操作条件。
根据本发明的方法得到的基本结果是成型制品不再是只有二种不同的塑料分子,而是有三种,即:在记忆效应下记得成形制品的原始形状的分子;在成型工序时是液态的,因而在最后热成型后记得成型制品所假定的较大尺寸的分子;最后一种分子记得成形制品在冷压操作中由成型制品所假定的最小尺寸的形状,在此操作中制品形成的尺寸小于最终所要求的尺寸。这三组分子的力的平衡的结果使成型制品得到所要求的形状而且尺寸稳定。
一般的方法可以被用来制造塑料管子,其中成型工位(例如,可以由挤塑工位构成)被设计成用它制造的管子的直径依所用材料的不同,大于最终要求的直径0.5至5%,在此工位上制造的管子被冷却后接着在一冷压工位上作短时间的压紧,使其直径依所用材料的不同小于最终所要求的直径的0.5至5%,由此,在冷压之后,管子就具有最终要求的尺寸。
冷压工位可以包括间歇运行的加压爪或带环形沟槽的滚筒,以接受每根管子的一半。假如管子的直径相当大,可以用3个或更多的加压爪以接受管子外周的有关部份,而不要用2个加压爪组成半壳。
应用本方法制塑料管端插口的特点是:将管端按已知的方法加热和扩张以形成插口,其直径按所用材料不同大于所要求的最终直径0.5至5%,将所得的插口冷却,随后在冷却状态下压紧至其直径小于最终所要求的直径,当插口从冷压工具中放松出来时,会进行弹性膨胀而达到所要求的最终直径。
用作说明的实施实例:
在一个壁厚2毫米,外径125毫米的聚乙烯管子上制一个末端插口
管子末端加热至120℃,随后用一扩张芯棒使之扩张至外径为131毫米,冷却后移去扩张芯棒,随后将插口在冷却状态下在二个壳状冷压爪间压紧,使管子的直径为123毫米。当插口从压爪中放松出来时,它的直径为125毫米,此直径可稳定地保持直至温度升至90℃。
在上文中已提到过依据本发明的方法不仅可以应用于插口及挤塑成型的管子,而且可以用于其它形状的会表面收缩的(除非经过处理)成型塑料制品,它们是用注塑、挤塑、加压或其他成型方法热成型的。加压工具的形状和尺寸必需按每个实例与成型制品相适应。
Claims (3)
1、一种方法,用以制造合成热塑性材料,特别是聚烯烃类如聚乙烯和聚丙烯的成形制品,在此方法中塑料材料被加热到或超过其软化温度,在此状态下成型为成形制品,随后冷却至低于其软化温度,其特征在于材料在热状态下成型为中间产品,它比最终要求的尺寸稍大,只有在它冷却以后,经材料紧密冷压,使之定形至所要求的尺寸。
2、按权利要求1的方法制造塑料管的应用,其中的成型工位可以由例如一挤塑工位组成,被设计为所制管子的直径大于最终所要求的直径,根据所用材料的不同,超过量为0.5至5%,在此工位上制出的管子被冷却,随后接着将之在冷压工位上以短时间压紧,根据所用材料的不同,压至其直径比最终所要求的直径小0.5至5%,这样就使管子在冷压后具有最终所要求的直径。
3、按权利要求1的方法制造塑料管末端插口的应用,其特征在于用已知方法加热管端,将之扩张以形成插口,其直径按所用材料不同比最终要求的直径大0.5至5%,将所得的插口冷却,随后在冷却状态下压紧至其直径小于最终要求的直径,这样使插口在从加压工具中放松出来时,经过弹性膨胀得到最终所要求的直径。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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AT0208192A AT398725B (de) | 1992-10-21 | 1992-10-21 | Verfahren zum herstellen von endmuffen an kunststoffrohren |
ATA2081/92 | 1992-10-21 |
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CN1093976A true CN1093976A (zh) | 1994-10-26 |
CN1049174C CN1049174C (zh) | 2000-02-09 |
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CN93120397A Expired - Fee Related CN1049174C (zh) | 1992-10-21 | 1993-10-21 | 制造塑料管的末端插口的方法 |
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US (1) | US5554332A (zh) |
EP (1) | EP0666790B1 (zh) |
JP (1) | JPH08502219A (zh) |
KR (1) | KR950703440A (zh) |
CN (1) | CN1049174C (zh) |
AT (2) | AT398725B (zh) |
AU (1) | AU670335B2 (zh) |
BG (1) | BG99592A (zh) |
BR (1) | BR9307276A (zh) |
CA (1) | CA2147481C (zh) |
CH (1) | CH0666790H1 (zh) |
CZ (1) | CZ101295A3 (zh) |
DE (1) | DE59306752C5 (zh) |
DK (1) | DK0666790T3 (zh) |
ES (1) | ES2105329T3 (zh) |
FI (1) | FI107135B (zh) |
GR (1) | GR3024657T3 (zh) |
NO (1) | NO951476L (zh) |
PL (1) | PL308476A1 (zh) |
RO (1) | RO117245B1 (zh) |
SK (1) | SK52595A3 (zh) |
WO (1) | WO1994008772A1 (zh) |
ZA (1) | ZA937786B (zh) |
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NL1016793C2 (nl) * | 2000-12-04 | 2002-06-05 | Simon Roelof Vasse | Filterbehuizing. |
US20040094852A1 (en) * | 2002-11-20 | 2004-05-20 | Deere & Company, A Delaware Corporation | Method for producing rotationally molded parts from semi-crystalline materials |
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MX2009010944A (es) * | 2007-04-13 | 2009-11-02 | Underground Solutions Technologies Group Inc | Conducto, fabricacion del mismo y proceso de fusion para el mismo. |
US8167338B2 (en) * | 2007-09-24 | 2012-05-01 | Cantex, Inc. | Non-metallic raceway for wiring and fiber optic cable and method of forming raceway |
US8579334B2 (en) * | 2008-08-06 | 2013-11-12 | Jain Irrigation Systems Limited | Pipe with integral male and female ends, a joint made using the same pipe, and processes of making the pipe and the joint |
JP2010156361A (ja) * | 2008-12-26 | 2010-07-15 | Nix Inc | 樹脂管及び樹脂管と継手との接続構造 |
EP2623284B1 (de) * | 2012-02-01 | 2017-04-12 | Lüers Maschinen- und Stahlbau GmbH | Verfahren und Vorrichtung zur Aufheizung eines Endabschnitts eines Kunststoffrohres |
CN109664312A (zh) * | 2019-01-18 | 2019-04-23 | 哈尔滨工业大学 | 基于热变形的生长型软体机器人预设变形方法 |
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US4482518A (en) * | 1981-10-02 | 1984-11-13 | Owens-Illinois, Inc. | Methods for reducing post-mold shrinkage of hollow oriented polyethylene terephthalate containers |
US4388356A (en) * | 1981-11-16 | 1983-06-14 | The Goodyear Tire & Rubber Company | Heat setting a thermoformed PET article utilizing a male plug as a constraint |
SE451249B (sv) * | 1984-01-27 | 1987-09-21 | Wirsbo Bruks Ab | Forfarande for framstellning av ett lettbojligt plastror med atminstone en krage |
GB2172540B (en) * | 1985-03-18 | 1988-12-21 | Metal Box Plc | Making dimensionally stable thermoplastic open-ended tubular articles |
DE3603060A1 (de) * | 1986-02-01 | 1987-08-06 | Prakla Seismos Ag | Verfahren zur verformung eines schlauches |
JPH069861B2 (ja) * | 1986-03-12 | 1994-02-09 | 株式会社吉野工業所 | プラスチック延伸パイプの熱固定装置 |
ES2081406T5 (es) * | 1991-08-31 | 2000-01-16 | Wirsbo Rohrprod Und Vertr Gmbh | Conexion de tubo y metodo para fabricar conexiones de tubo en poliolefina. |
-
1992
- 1992-10-21 AT AT0208192A patent/AT398725B/de not_active IP Right Cessation
-
1993
- 1993-10-20 BR BR9307276A patent/BR9307276A/pt not_active Application Discontinuation
- 1993-10-20 DK DK93922858.1T patent/DK0666790T3/da active
- 1993-10-20 SK SK525-95A patent/SK52595A3/sk unknown
- 1993-10-20 PL PL93308476A patent/PL308476A1/xx unknown
- 1993-10-20 KR KR1019950701473A patent/KR950703440A/ko not_active Application Discontinuation
- 1993-10-20 DE DE59306752T patent/DE59306752C5/de not_active Expired - Lifetime
- 1993-10-20 AU AU51720/93A patent/AU670335B2/en not_active Ceased
- 1993-10-20 RO RO95-00765A patent/RO117245B1/ro unknown
- 1993-10-20 CH CH93922858T patent/CH0666790H1/de unknown
- 1993-10-20 AT AT93922858T patent/ATE154281T1/de not_active IP Right Cessation
- 1993-10-20 US US08/424,316 patent/US5554332A/en not_active Expired - Lifetime
- 1993-10-20 EP EP93922858A patent/EP0666790B1/de not_active Expired - Lifetime
- 1993-10-20 ZA ZA937786A patent/ZA937786B/xx unknown
- 1993-10-20 CZ CZ951012A patent/CZ101295A3/cs unknown
- 1993-10-20 WO PCT/AT1993/000159 patent/WO1994008772A1/de active IP Right Grant
- 1993-10-20 CA CA002147481A patent/CA2147481C/en not_active Expired - Fee Related
- 1993-10-20 ES ES93922858T patent/ES2105329T3/es not_active Expired - Lifetime
- 1993-10-20 JP JP6509434A patent/JPH08502219A/ja active Pending
- 1993-10-21 CN CN93120397A patent/CN1049174C/zh not_active Expired - Fee Related
-
1995
- 1995-04-19 NO NO951476A patent/NO951476L/no unknown
- 1995-04-19 FI FI951867A patent/FI107135B/fi not_active IP Right Cessation
- 1995-04-20 BG BG99592A patent/BG99592A/bg unknown
-
1997
- 1997-09-09 GR GR970402299T patent/GR3024657T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
BG99592A (bg) | 1996-07-31 |
KR950703440A (ko) | 1995-09-20 |
CA2147481C (en) | 2004-09-07 |
CN1049174C (zh) | 2000-02-09 |
EP0666790B1 (de) | 1997-06-11 |
ATE154281T1 (de) | 1997-06-15 |
NO951476D0 (no) | 1995-04-19 |
FI951867A (fi) | 1995-04-19 |
GR3024657T3 (en) | 1997-12-31 |
ATA208192A (de) | 1994-06-15 |
DK0666790T3 (da) | 1997-12-29 |
EP0666790A1 (de) | 1995-08-16 |
ES2105329T3 (es) | 1997-10-16 |
SK52595A3 (en) | 1995-08-09 |
JPH08502219A (ja) | 1996-03-12 |
DE59306752C5 (de) | 2009-12-24 |
CA2147481A1 (en) | 1994-04-28 |
RO117245B1 (ro) | 2001-12-28 |
CZ101295A3 (en) | 1995-10-18 |
CH0666790H1 (zh) | 2013-09-30 |
FI107135B (fi) | 2001-06-15 |
AT398725B (de) | 1995-01-25 |
AU5172093A (en) | 1994-05-09 |
AU670335B2 (en) | 1996-07-11 |
BR9307276A (pt) | 1999-06-01 |
ZA937786B (en) | 1994-05-16 |
FI951867A0 (fi) | 1995-04-19 |
PL308476A1 (en) | 1995-08-07 |
WO1994008772A1 (de) | 1994-04-28 |
US5554332A (en) | 1996-09-10 |
DE59306752D1 (de) | 1997-07-17 |
NO951476L (no) | 1995-04-19 |
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