CN87107232A - Paper web dry drying method and equipment - Google Patents
Paper web dry drying method and equipment Download PDFInfo
- Publication number
- CN87107232A CN87107232A CN87107232.7A CN87107232A CN87107232A CN 87107232 A CN87107232 A CN 87107232A CN 87107232 A CN87107232 A CN 87107232A CN 87107232 A CN87107232 A CN 87107232A
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- CN
- China
- Prior art keywords
- paper web
- felt
- roll
- suction roll
- dryer
- Prior art date
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- Expired - Lifetime
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-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
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- Paper (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A kind of equipment and method that the paper web both sides are dry successively.First dryer roll is arranged in the equipment and, paper web first side is heated around first felt of this roller.First felt and paper web are around the first downstream suction roll.First deflector roll is drawn first felt from first suction roll.Second suction roll is adjacent with first suction roll.Second felt stretches around second suction roll, and second deflector roll guides second felt to second suction roll, forms a paper web transfer portion between first and second felt, when paper web passes through from transfer portion, paper web is clipped between felt.The arrangement of downstream second dryer roll is between second felt and second dryer roll paper web, to second side heating of paper web.
Description
The present invention is relevant with the method and apparatus of dry-web both sides successively.Concrete relevant BEL RUN type drying section wherein has first drying section, a side of dry-web, the opposite side of one second drying section dry-web then.
In the traditional drying portion of BEL RUN type configuration, available four rollers of independent felt section are formed formation.On the typical case, in these roller groups dryer roll and suction roll are arranged, these rollers do not form open draw in its configuration, because paper web is used dry felt support all the time.When one group of drier of paper web under one group of drier advances to, the same side that often is paper web is towards continuous dryer roll.But, for make paper web in addition side the paper web of no support must be transferred to next dry felt in the past and get on towards continuous dryer roll.
Adopted a kind of so-called single felt drying section afterwards, the paper web section and the felt section of associating wherein arranged,, passed through from dry drum barrel up and down continuously by the sine wave curve configuration.Though the paper web between this dry up and down drum barrel that is arranged in succession provide the felt support, and dry up and down drum barrel is unnecessary substantially, because felt is clipped between paper web and the dryer roll, thereby during by following dryer roll, greatly reduces the desiccation of paper web.In addition, this felt portion still can not do dry in both sides.
In above-mentioned BEL RUN configuration and single felt drier, problem still exists, because when paper web passed through from former groups of driers, only the one side was dried.Therefore, this arrangement makes the intensity and the performance on surface that difference be arranged.In addition, each surperficial fineness of paper web has difference, when requiring the paper both sides that identical characteristics are arranged, just becomes problem.And curling reaction and inhomogeneous reaction that humidity is changed in the above-mentioned drying section also become problem.
The present invention seeks to overcome above-mentioned and BEL RUN and the relevant problem of the single felt drying section configuration of other types, its method is that a paper web transfer portion that is formed by first and second felt is set, when paper web passes through from transfer portion, be sandwiched between the felt, thereby when paper web around next dryer roll when advancing and the area of heating surface actual contact of next dryer roll.
Therefore, main purpose of the present invention is to propose a kind of equipment, can overcome the above-mentioned shortcoming that scheme in the skill field is arranged earlier, has done meaningful and advanced contribution is arranged for the paper dryer technology.
Another object of the present invention, be to propose a kind of equipment, first felt wherein is a circulating ring, makes sinusoidal wave form and passes through on dryer roll of alternately placing and suction roll, second felt wherein is a circulating ring, make sinusoidal wave form, on dryer roll of alternately placing and suction roll, pass through, thus some dryer rolls of first group, the first side actual contact with paper web, the second side actual contact of second group some dryer rolls and paper web, thus successively that the both sides of paper web are alternately dry.
Another object of the present invention is to propose a kind of method, and is successively that the both sides of paper web are alternately dry, method comprises the pairing segment guiding with a paper web and first felt, around first dryer roll, paper web is clipped between first felt and first dryer roll, with first side heating of paper web.With first pairing segment guiding,, first felt is clipped between the paper web and first suction roll then around first suction roll.Second felt is guided, around second suction roll, thereby form a paper web transfer portion between first and second felt, make paper web under the support of first felt, be imported into the paper web transfer portion, paper web is placed between first and second felt, to from the paper web transfer portion, draw by the paper web of order, around second suction roll, second felt is between the paper web and second suction roll, with the pairing segment guiding of the paper web and second felt, centers on second dryer roll then, paper web is clipped between second felt and second dryer roll, to second side heating of paper web.
Other purposes of the present invention and advantage allly be familiar with this skill field person, studied in conjunction with the accompanying drawings with literary composition after the detailed description done of claims after, just can clearly understand.
The present invention is relevant with the Apparatus and method for of dry-web both sides successively.First dryer roll is arranged in the equipment, and paper web is around the part circumferential extension of first dryer roll.First felt stretches around the part of first dryer roll, thereby paper web is clipped between first felt and first dryer roll, to the first side drying of paper web.First suction roll is placed on the downstream of first dryer roll, and the rotation of first suction roll is parallel with the rotation of first dryer roll and spacing is arranged.First felt and paper web stretch around the part of the first suction roll circumference, thereby felt is clipped between the paper web and first suction roll.First guider guides first felt, and leaves on first suction roll, and second suction roll and the first suction roll placed adjacent, the rotation of second suction roll is parallel with the rotation of first suction roll and spacing is arranged.Second felt is around second suction roll, and second guider guides second felt to second suction roll, makes to form a paper web transfer portion between first and second felt, thereby when paper web passes through transfer portion, is sandwiched between the felt.Second dryer roll is placed on the downstream of second suction roll, and the rotation of second dryer roll is parallel with the rotation of second suction roll, thereby paper web is clipped between second felt and second dryer roll, to the second side drying of paper web.
In a comparison special embodiment of the present invention, first felt is a circulating ring, makes sinusoidal waveform and passes through from first dryer roll and the suction roll that replaces.
And, second felt is a circulating ring, makes sinusoidal waveform and passes through from second dryer roll and the suction roll that replaces, thus first side of the first dryer roll actual contact paper web, the second dryer roll actual contact paper web, second side, thus successively fluidized drying is taken turns in the both sides of paper web.
One first deflector roll is arranged in first guider, and to the guiding of first felt, second guider has one second deflector roll, and second felt is guided.
The present invention also comprises a kind of method, the both sides of dry-web in turn successively, in this method in steps, a pairing segment guiding with the paper web and first felt, around first dryer roll, thereby paper web is clipped between first felt and first dryer roll, to first side heating of paper web.Then, the pairing segment guiding to the paper web and first felt around one first suction roll, thereby is clipped in first felt between the paper web and first suction roll.Then first felt is guided, around one first deflector roll, second felt is guided from second deflector roll, around second suction roll, thereby paper web transfer portion of formation between first and second felt, paper web is introduced the paper web transfer portion with the first felt support, and paper web is between first and second felt.The paper web guiding that will occur from the paper web transfer portion, around second suction roll, thereby second felt is between the paper web and second suction roll.With the pairing segment guiding,, paper web is clipped between second felt and second dryer roll then, to second side heating of paper web around one second dryer roll.
Though detailed description hereinafter has to a certain degree particularity to narration of the present invention, is familiar with this area person and will understand that, can make many modifications and variations to notion of the present invention, and does not break away from the spirit and scope of the present invention that literary composition back claims define.
Fig. 1 illustrates the first side drying of preceding four groups of dryer rolls with paper web for the side-looking of the BEL RUN type drying section in the skill field is arranged earlier.
Fig. 2 is the side-looking of BEL RUN type drying section configuration of the present invention, and diagram is not from the paper web transfer device of first felt to the open draw of second felt.
Fig. 3 is the amplification side-looking of Fig. 2, detailed shows that the paper web transfer portion can make the dorsal part of paper web, can with the dryer roll actual contact of back.
In whole each figure of accompanying drawing, identical parts indicate with the identical number of marking on a map.
Fig. 1 is the side-looking of traditional B EL RUN type drying section, and A is wherein arranged, B, and C, four groups of D are with paper web 1 drying.As shown in Figure 1, with paper web 1 by sinusoidal wave form guiding, around some dryer rolls 2,2 ' and 2 " and water transferring roller 3,3 ' and 3 ".First felt, 4 corral deflector rolls 5,5 ', 5 ", 5 " ' and 5 " ", and when paper web alternately by dryer roll and suction roll 3,2,3 ', 2 ', during 3 " and 2 ", with the paper web support.The dryer roll 6,6 of second group of B ' and 6 ", have suction roll 7,7 ' and 7 " alternately place betwixt, make second felt 4 ' with the form of sine wave around suction roll and dryer roll 7,6,7 ', 6 ', 7 " and 6 ".When dryer roll 2 " paper web 1 of support second felt 4 ' near when rotation, paper web 1 be can't help felt 4 supports, and paper web 1 is shifted to second felt 4, and around suction roll 7.Yet from Fig. 1 as seen, the same side 8 of paper web 1 and dryer roll 2,2 ', 2 ", 6,6 ' and 6 " the Contact Heating surface, thereby with homonymy 8 dryings.
As shown in Figure 2, the present invention can make paper web 1A drive in the wrong direction to second B1 from first A1, thereby when paper web 1A passes through from first A1, the first side 8A and the dryer roll 2A of paper web 1A, 2A " and 2A " actual contact.In second group, second side 9 and the dryer roll 6A of paper web 1A, 6A ' and 6A " area of heating surface actual contact.
Fig. 3 is the amplification decomposition figure of transfer portion shown in Figure 2, shows driving in the wrong direction of paper web 1A.Further, referring to Fig. 3, represent that with figure number 10 it is overall, dry-web 1A both sides 8A and 9 equipment have first dryer roll successively, and paper web is around the first dryer roll 2A, and " part of circumference stretches.The first felt 4A is around the first dryer roll 2A " a part stretch, thereby paper web 1A is clipped in the first felt 4A and the first dryer roll 2A " between, to the first side 8A heating of paper web 1A.The downstream that the first suction roll 3A " is placed on the first dryer roll 2A ".The rotation of the first suction roll 3A " ' rotation, with the first dryer roll 2A " is parallel and spacing is arranged.The first felt 4A and paper web 1A are around the first suction roll 3A " part of circumference stretches, thereby the first felt 4A is clipped in the paper web 1A and the first suction roll 3A " ' between.The first guider 5A as shown in Figure 2, with the first felt 4A from the first suction roll 3A " ' be directed away.The second suction roll 7A and the first suction roll 3A " ' placed adjacent, the rotation of the second suction roll 7A and the first suction roll 3A " ' rotation parallel and spacing is arranged.The second felt 4A ' stretches around the second suction roll 7A, second guider 12 shown in Figure 2, the second felt 4A ' is guided to suction roll 7A, thereby in first and second felt 4A and paper web transfer portion of between 4A ' formation, represent that with figure number 14 it is overall, when paper web 1A passes through from transfer portion 14, be clipped between felt 4A and the 4A '.The second dryer roll 6A is placed on the downstream of the second suction roll 7A, and the rotation of the second dryer roll 6A is parallel with the rotation of the second suction roll 7A, thereby paper web 1A is clipped between the second felt 4A ' and the second dryer roll 6A, to second side, 9 heating of paper web 1A.
As shown in Figure 2, the first felt 4A is a circulating ring, makes sinusoidal waveform and stretches, by dryer roll and the suction roll 3A that replaces, 2A, 3A ', 3A ", 2A " and 3A " '; contact; second group of dryer roll 6A 6A ' and 6A thereby dryer roll is actual with the first side 8A of paper web 1A " and second side, 9 actual contact of paper web 1A, thereby the both sides of paper web 1A are alternately dry successively.
More specifically, first guider has the first deflector roll 5A to guide the first felt 4A, and second guider has second deflector roll, 12 guiding, the second felt 4A '.
In running of the present invention, with the both sides 8A and 9 of paper web 1A, alternately dry successively, wherein step is as follows:
1. the pairing segment with the paper web 1A and the first felt 4A guides by the first dryer roll 2A that centers on shown in Figure 3 ", thereby paper web 1A is clipped in the first felt 4A and the first dryer roll 2A " between, to the first side 8A heating of paper web 1A.
2. then with the pairing segment guiding of the paper web 1A and the first felt 4A, center on one first suction roll 3A " ', make the first felt 4A be sandwiched in the paper web 1A and the first suction roll 3A " ' between.
3. guide the first felt 4A, make it around the first deflector roll 5A, guide the second felt 4A ', make it to center on to the second suction roll 7A from second deflector roll 12, thereby between first and second felt 4A and 4A ' forms a paper web transfer portion 14, thereby the paper web 1A of the first felt 4A support is introduced paper web transfer portion 14, and paper web 1A is between first and second felt 4A and the 4A '.
4. the paper web 1A traction that will occur from paper web transfer portion 14 around the second suction roll 7A, thereby is between the paper web 1A and the second suction roll 7A the second felt 4A '.
5. then paper web 1A is subtracted the pairing segment guiding of the second felt 4A ', make it around the second dryer roll 6A, thereby paper web 1A is clipped between the second felt 4A ' and the second dryer roll 6A, make second side, 9 heating of paper web 1A.
The present invention proposes a kind of simple measure, to actively shift in the continuous dryer group of paper web in the structure of BEL RUN type, thereby can alternately with the both sides drying of paper web, make the paper product of production that uniform film feature be arranged, surface strength and fineness, and do not have curling tendency.
In first dryer group, suction roll is placed on the below of dryer roll, and in second dryer group, suction roll is placed on the top of dryer roll. This structure impels above-mentioned simplification paper web transfer part to form, thereby paper web can be shifted to second felt from first felt.
Claims (6)
1, a kind of method of paper web drying, form dryer roll group and suction roll group in this method in steps, the pairing segment that a paper web and felt are arranged is around each roller, it is characterized in that the felt section alternately is placed on the upper and lower of roller group, and be two suction rolls are placed in the contact-segment between the dryer roll group, thereby the upper and lower sides upset with paper web contacts with roller, just makes the both sides of paper web can take turns fluidized drying.
2, with the paper web both sides equipment of drying successively, in this equipment, have following:
One first dryer roll, paper web stretches around the part of its circumference;
One first felt stretches around this one of this first roller, thereby paper web is clipped between this first felt and this first dryer roll, to first side heating of paper web;
First suction roll is placed on the downstream of this first dryer roll, and the rotation of the rotation of this first suction roll and this first dryer roll walks abreast and spacing is arranged;
This first felt and paper web around a stretching, extension of this first suction roll circumference, thereby are clipped in this first felt between paper web and this first suction roll;
First guider is drawn this first felt from this first suction roll;
One second suction roll and this first suction roll placed adjacent, this rotation of the rotation of this second suction roll and this first suction roll is parallel and spacing is arranged;
One second felt stretches around this second suction roll;
Second guider to this second suction roll guiding, makes this second felt form a paper web transfer portion between this first and second felt, thereby when paper web passes through in this transfer portion, is sandwiched between this felt;
One second dryer roll is placed on the downstream of this second suction roll, and the rotation of this second dryer roll is parallel with the rotation of this second suction roll, thereby paper web is clipped between this second felt and this second dryer roll, to second side heating of paper web.
3, the equipment of setting forth as claim 2 is characterized in that this first felt is a circulating ring, makes sinusoidal wave form and alternately passes through first group dryer roll and suction roll.
4, the equipment of setting forth as claim 2, it is characterized in that this first felt is a circulating ring, make sinusoidal wave form and alternately pass through first group dryer roll and suction roll, thereby this first side of this dryer roll actual contact paper web of this first roller group, this second side of second group dryer roll actual contact paper web, thus the paper web both sides are alternately dry successively.
5, the equipment as setting forth in the claim 5, it is characterized by have in first guider following:
First deflector roll guides this first felt
This second guider comprises:
This second felt of second rail guidance.
6, the method for dry-web both sides in turn successively comprises in this method that step is as follows:
Pairing segment guiding with the paper web and first felt around first dryer roll, thereby is clipped in paper web between first felt and first dryer roll, and paper web first side is heated;
With the pairing segment guiding of the paper web and first felt,, thereby first felt is clipped between the paper web and first suction roll then around first suction roll;
Guide first felt, make it around first deflector roll;
Guide second felt from second deflector roll, second suction roll is centered on, make to form a paper web transfer portion between the one or two felt, with the first felt support paper web, be introduced into the paper web transfer portion, paper web is clipped between first and second felt;
To shift the paper web traction that occurs the part from paper web, and, second felt will be between the paper web and second suction roll around second suction roll;
With the pairing segment guiding of the paper web and second felt,, paper web is between second felt and second dryer roll then, to second side heating of paper web around second dryer roll.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986185019U JPS6389996U (en) | 1986-12-02 | 1986-12-02 | |
| JP185019/86 | 1986-12-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87107232A true CN87107232A (en) | 1988-07-06 |
| CN1013598B CN1013598B (en) | 1991-08-21 |
Family
ID=16163349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87107232A Expired CN1013598B (en) | 1986-12-02 | 1987-12-02 | Method and apparatus for drying paper web |
Country Status (16)
| Country | Link |
|---|---|
| EP (1) | EP0334899B2 (en) |
| JP (1) | JPS6389996U (en) |
| KR (1) | KR940005201B1 (en) |
| CN (1) | CN1013598B (en) |
| AR (1) | AR246571A1 (en) |
| AT (1) | ATE70868T1 (en) |
| AU (1) | AU612349B2 (en) |
| BR (1) | BR8707946A (en) |
| CA (1) | CA1340582C (en) |
| DE (3) | DE334899T1 (en) |
| FI (2) | FI892657A0 (en) |
| IN (1) | IN168979B (en) |
| PH (1) | PH30381A (en) |
| PL (1) | PL158253B1 (en) |
| WO (1) | WO1988004206A2 (en) |
| ZA (1) | ZA879009B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172854A (en) * | 2019-06-28 | 2019-08-27 | 夏德亮 | A kind of papermaking dryer based on air-flow transformation |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5144758A (en) * | 1987-02-13 | 1992-09-08 | Borgeir Skaugen | Apparatus for drying a web |
| US4807371A (en) * | 1987-02-13 | 1989-02-28 | Beloit Corporation | Apparatus for maintaining the edges of a web in conformity with a dryer felt |
| US5101577A (en) * | 1987-02-13 | 1992-04-07 | Beloit Corporation | Web transfer apparatus |
| US4918836A (en) * | 1987-02-13 | 1990-04-24 | Beloit Corporation | Tail cutter apparatus and method |
| US5279049A (en) * | 1987-02-13 | 1994-01-18 | Beloit Technologies, Inc. | Process for the restrained drying of a paper web |
| US5241760A (en) * | 1987-02-13 | 1993-09-07 | Beloit Technologies, Inc. | Dryer apparatus |
| CA1328167C (en) * | 1987-02-13 | 1994-04-05 | Borgeir Skaugen | Apparatus for drying a web |
| US5404653A (en) * | 1987-02-13 | 1995-04-11 | Beloit Technologies, Inc. | Apparatus for drying a web |
| US4934067A (en) * | 1987-02-13 | 1990-06-19 | Beloit Corporation | Apparatus for drying a web |
| DE3721734A1 (en) * | 1987-07-01 | 1989-01-12 | Voith Gmbh J M | METHOD FOR DRYING A RUNNING TRAIN AND PAPER OR CARDBOARD MACHINE FOR CARRYING OUT THE METHOD |
| FI82097C (en) * | 1989-02-17 | 1991-01-10 | Valmet Paper Machinery Inc | Multi-cylinder dryer in a paper machine |
| JPH0791798B2 (en) * | 1989-12-22 | 1995-10-04 | 敷島紡績株式会社 | Papermaking dryer felt |
| US5184408A (en) * | 1990-01-19 | 1993-02-09 | J. M. Voith Gmbh | Dryer section |
| JP2558375B2 (en) * | 1990-05-30 | 1996-11-27 | 三菱製紙株式会社 | Method of detecting paper break in paper making dryer and dryer canvas used therefor |
| DE4142524A1 (en) * | 1991-12-21 | 1993-06-24 | Voith Gmbh J M | DRY LOT |
| US5321899A (en) * | 1992-04-13 | 1994-06-21 | J. M. Voith Gmbh | Dry end |
| US5884415A (en) * | 1992-04-24 | 1999-03-23 | Beloit Technologies, Inc. | Paper making machine providing curl control |
| US5542193A (en) * | 1992-04-24 | 1996-08-06 | Beloit Technologies, Inc. | Dryer group for curl control |
| DE19934777A1 (en) * | 1999-07-23 | 2001-01-25 | Voith Paper Patent Gmbh | Dryer section producing or finishing paper, card or tissue web includes detachment region without support, which is provided further away by drying sieve |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2537129A (en) * | 1945-10-05 | 1951-01-09 | Beloit Iron Works | Structure for web transfers |
| FI53333C (en) * | 1972-11-13 | 1978-04-10 | Valmet Oy | TORKNINGSCYLINDERGRUPP I EN FLERCYLINDERTORK FOER EN MATERIALBANA I SYNNERHET FOER PAPPER |
| US4359827B1 (en) † | 1979-11-05 | 1994-03-29 | Keith V Thomas | High speed paper drying |
| US4934067A (en) * | 1987-02-13 | 1990-06-19 | Beloit Corporation | Apparatus for drying a web |
| DE3807856A1 (en) * | 1988-03-10 | 1989-09-21 | Voith Gmbh J M | METHOD FOR DRYING A MATERIAL RAIL AND DEVICE FOR CARRYING OUT THIS METHOD |
| DE3807858A1 (en) * | 1988-03-10 | 1989-09-21 | Voith Gmbh J M | Process for drying a material web and apparatus for carrying out this process |
-
1986
- 1986-12-02 JP JP1986185019U patent/JPS6389996U/ja active Pending
-
1987
- 1987-11-12 BR BR8707946A patent/BR8707946A/en not_active IP Right Cessation
- 1987-11-12 WO PCT/US1987/003087 patent/WO1988004206A2/en active Application Filing
- 1987-11-12 EP EP88901398A patent/EP0334899B2/en not_active Expired - Lifetime
- 1987-11-12 DE DE198888901398T patent/DE334899T1/en active Pending
- 1987-11-12 DE DE8717870U patent/DE8717870U1/en not_active Expired - Lifetime
- 1987-11-12 AT AT88901398T patent/ATE70868T1/en not_active IP Right Cessation
- 1987-11-12 AU AU12439/88A patent/AU612349B2/en not_active Expired
- 1987-11-12 KR KR1019880700915A patent/KR940005201B1/en not_active IP Right Cessation
- 1987-11-12 DE DE8888901398T patent/DE3775567D1/en not_active Expired - Lifetime
- 1987-11-30 CA CA000553056A patent/CA1340582C/en not_active Expired - Fee Related
- 1987-12-01 IN IN940/CAL/87A patent/IN168979B/en unknown
- 1987-12-01 ZA ZA879009A patent/ZA879009B/en unknown
- 1987-12-01 PH PH36148A patent/PH30381A/en unknown
- 1987-12-02 PL PL1987269182A patent/PL158253B1/en unknown
- 1987-12-02 CN CN87107232A patent/CN1013598B/en not_active Expired
- 1987-12-21 AR AR87309466A patent/AR246571A1/en active
-
1989
- 1989-06-01 FI FI892657A patent/FI892657A0/en not_active Application Discontinuation
-
1996
- 1996-01-25 FI FI960348A patent/FI960348A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172854A (en) * | 2019-06-28 | 2019-08-27 | 夏德亮 | A kind of papermaking dryer based on air-flow transformation |
Also Published As
| Publication number | Publication date |
|---|---|
| PL158253B1 (en) | 1992-08-31 |
| KR940005201B1 (en) | 1994-06-13 |
| KR890700180A (en) | 1989-03-10 |
| CN1013598B (en) | 1991-08-21 |
| FI960348A0 (en) | 1996-01-25 |
| FI960348A (en) | 1996-01-25 |
| IN168979B (en) | 1991-08-03 |
| AU1243988A (en) | 1988-06-30 |
| FI892657A (en) | 1989-06-01 |
| DE3775567D1 (en) | 1992-02-06 |
| CA1340582C (en) | 1999-06-08 |
| EP0334899A1 (en) | 1989-10-04 |
| AR246571A1 (en) | 1994-08-31 |
| EP0334899B1 (en) | 1991-12-27 |
| BR8707946A (en) | 1990-02-13 |
| JPS6389996U (en) | 1988-06-10 |
| ZA879009B (en) | 1988-09-28 |
| WO1988004206A2 (en) | 1988-06-16 |
| ATE70868T1 (en) | 1992-01-15 |
| EP0334899B2 (en) | 1999-08-25 |
| AU612349B2 (en) | 1991-07-11 |
| WO1988004206A3 (en) | 1988-06-30 |
| DE334899T1 (en) | 1990-07-26 |
| DE8717870U1 (en) | 1991-03-28 |
| PH30381A (en) | 1997-04-15 |
| FI892657A0 (en) | 1989-06-01 |
| PL269182A1 (en) | 1988-08-18 |
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