DK155930B - DEVICE FOR MANUFACTURING MINERAL FIBER MATS - Google Patents
DEVICE FOR MANUFACTURING MINERAL FIBER MATS Download PDFInfo
- Publication number
- DK155930B DK155930B DK568276AA DK568276A DK155930B DK 155930 B DK155930 B DK 155930B DK 568276A A DK568276A A DK 568276AA DK 568276 A DK568276 A DK 568276A DK 155930 B DK155930 B DK 155930B
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- DK
- Denmark
- Prior art keywords
- spinning chamber
- chamber
- cross
- spinning
- section
- Prior art date
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Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
- D04H1/4218—Glass fibres
- D04H1/4226—Glass fibres characterised by the apparatus for manufacturing the glass fleece
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
- Preliminary Treatment Of Fibers (AREA)
Description
iin
DK 155930 BDK 155930 B
Opfindelsen angår en indretning til fremstilling af måtter af mineraluldsfibre, hvilken indretning omfatter i det mindste en omkring en i hovedsagen vandret akse roterende cylinder, hvis udvendige overflade tilføres en smelte af mineralmaterialet, 5 et i hovedsagen vandret spindekammer med rektangulært tværsnit og to lodrette vægge og et gasgennemtrængeligt opsamlingsbånd, som er anbragt ved spindekammerets udgangsende, hvilket spindekammer er tilknyttet et blæseorgan til tilvejebringelse af en trykforskel imellem spindekammerets indgangsende og udlo gangsende.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for producing mats of mineral wool fibers, which comprises at least one cylinder rotating about a substantially horizontal axis, the outer surface of which is fed to a melt of the mineral material, a substantially horizontal spinning chamber of rectangular cross section, and two vertical walls and a gas-permeable collecting tape disposed at the exit end of the spinning chamber, which spinning chamber is associated with a blower means to provide a pressure difference between the input end and exit end of the spinning chamber.
En sådan indretning kendes fra US-patentskrift nr. 2.172.153, idet den roterende cylinder her er erstattet af en skråtstå-ende roterende plan eller konkav skive, og spindekammeret ved 15 indgangsenden begynder med et cylindrisk afsnit med cirkulært tværsnit og går via et afsnit med ovalt tværsnit med til at begynde med voksende størrelse, over i et afsnit med rektangulært og aftagende tværsnitsareal. En faldende smeltestråle rammer omtrent an imod midten af den skiveformede overflade og 20 bliver på grund af centrifugalkraften spredt ud imod randen og herfra slynget ud under dannelse af fibre. Fibrene bliver kun slynget ud langs en per i fer i 1 i nie. Fiberproduktionshastigheden er derfor forholdsvis begrænset.Such a device is known from US Patent No. 2,172,153, the rotating cylinder being here replaced by an oblique rotating plane or concave disc and the spinning chamber at the entrance end beginning with a cylindrical section of circular cross section and passing through a section. with oval cross section, initially, with increasing size, into a section with rectangular and decreasing cross sectional area. A descending melting jet strikes approximately toward the center of the disc-shaped surface and, due to centrifugal force, 20 spreads out toward the rim and from here is thrown out to form fibers. The fibers are only thrown out along one pair in 1 inch. The rate of fiber production is therefore relatively limited.
25 Fra US-patentskri ft nr. 3.787.194 kendes der en indretning til fremstilling af mineraluldsfibermåtter, hvor fibrene sammen med en strøm af bæreluft passerer lodret nedad imod et opsamlingsbånd via et spindekammer, der afgrænses af vægge, som allerede fra indgangsenden har et indsnævrende forløb.25 U.S. Patent No. 3,787,194 discloses a device for making mineral wool fiber mats, wherein the fibers, together with a stream of carrier air, pass vertically downwardly against a collection band via a spinning chamber bounded by walls which already have a narrowing from the entrance end progress.
30 På grund af utilfredsstillende fiberfremstillingshastigheder anvendes der nu fortrinsvis vandret stående roterende cylindre, til hvis udvendige overflade mineralsmelten tilføres. Denne fordeler sig langs et bånd, som omslutter cylinderen og som 35 også betegnes som en smeltering. Ved hjælp af centrifugalkraften løsner der sig små dråber fra hele smelteringen. Disse små dråber trækker fibrene med sig. Herved bliver der langs hver periferi 1inie på cylinderen samtidigt udtrukket flereDue to unsatisfactory fiber production rates, horizontally standing rotating cylinders are now preferably applied to the outer surface of which the mineral melt is supplied. This is distributed along a belt which encloses the cylinder and which is also referred to as a melting. With the help of centrifugal force, small droplets from the entire melting ring are released. These small drops draw the fibers with them. Hereby, at each periphery, one line on the cylinder is simultaneously drawn several
DK 155930BDK 155930B
2 fibre. De længst opstrøms fremstillede fibre kan herved have tendens til at kollidere med de længere nedstrøms fremstillede fibre. Samtidigt er der desværre også tendens til dannelse af små totter eller fnug, som i de færdige fibermåtter har vist 5 sig at fremstå som knopper og sammenf i 1 trede klumper, som generer måttens ensartethed.2 fibers. The longest upstream fibers may thereby tend to collide with the longer downstream fibers. At the same time, unfortunately, there is also a tendency to form small tufts or flakes which, in the finished fiber mats, have been found to appear as buds and intertwine into 1 stumps which generate the uniformity of the mat.
Det er herfor formålet med opfindelsen at videreudvikle en indretning af den indledningsvis nævnte type med en roterende 10 cylinder som fiberfremsti 11 ingsorgan, således at den øgede tendens til ukontrolleret totdannelse reduceres samtidigt med, at der opnås ensartede fibermåtter selv ved høje fiberfrem-sti11 i ngshastigheder, 15 Dette opnås ved, at indretningen ifølge opfindelsen er ejendommeligt ved, at spindekammerets tværsnit aftager fra 5 til 40% begyndende ved indgangsenden og over mindst 50% af den totale længde af kammeret imellem indgangsenden og udgangsenden. Herved sikres, at der inden i det vandret forløbende spinde-20 kammer tilvejebringes en accelererende i hovedsagen turbolens-fri gasstrøm med successiv stigende hastighed. Fibrene vil herved blive revet med i i hovedsagen parallelle baner, idet de længst opstrøms fremstillede fibre når længere ud set i radial retning før medrivningen, hvorved mulighed for ko 11 i -25 sion reduceres. Som følge af at spindekammerets indgangsende holdes så stor som mulig, opnås der yderligere modvirken af turbolensdannelse.It is for this purpose of the invention to further develop a device of the type mentioned initially with a rotating cylinder as fiber making means, so that the increased tendency for uncontrolled tooth formation is reduced while at the same time achieving uniform fiber mats even at high fiber production rates. This is achieved by the device according to the invention being characterized in that the cross-section of the spinning chamber decreases from 5 to 40% starting at the entrance end and at least 50% of the total length of the chamber between the entrance end and the exit end. This ensures that within the horizontally extending spinning chamber an accelerating substantially turbulence-free gas flow is provided with successively increasing velocity. The fibers will thereby be torn along substantially parallel webs, the longest upstream fibers reaching farther in the radial direction prior to entrainment, thereby reducing the possibility of cow 11 in -25 sion. Due to the large end of the spinning chamber being kept as large as possible, further counteracting of turbulence is achieved.
Opfindelsen forklares nedenfor under henvisning til tegningen, 30 hvor fig. 1 viser stærkt skematiseret en foretrukken indretning til udøvelse af fremgangsmåden ifølge opfindelsen, set i snit fra siden, og 35 fig. 2 et vandret snit efter linien II-II i fig. 1.The invention is explained below with reference to the drawing, in which fig. 1 is a highly schematic side elevational view of a preferred device for carrying out the method of the invention; and FIG. 2 is a horizontal section along line II-II of FIG. First
Som antydet i fig. l dannes mineralulden ved spindekammerets 1 ene ende, indgangsenden 2, ved at smeltet mineralmateriale 3As indicated in FIG. 1, the mineral wool is formed at one end of the spinning chamber 1, the input end 2, by melting mineral material 3
DK 155930 BDK 155930 B
3 udleveres fra et eller flere mundstykker 4 i retning imod et fibreringsaggregat 5, som består af mindst én og fortrinsvis to eller flere hurtigt roterende cylindre 6 med i hovedsagen vandrette aksler. Fra cylinderen 6 slynges på grund af centri-5 fugalkraften mineralsmelten ud i form af tynde fibre 7, samt perler, som ikke underkastes fiberdannelse. Det dannede mineraluldsmateriale rives af en gasstrøm med ind i spindekammeret 1 og videre imod spindekammerets anden ende, udgangsenden 8. Gasstrømmen igennem spindekammeret 1 tilvejebringes af et blæ-10 seorgan 9, som er beliggende på den anden side af spindekamme-rets udgangsende, og som suger luft igennem spindekammeret 1.3 is delivered from one or more nozzles 4 in the direction of a fibrating assembly 5 which consists of at least one and preferably two or more fast rotating cylinders 6 having generally horizontal shafts. Because of the centrifugal force 5, the mineral melt is thrown out of the cylinder 6 in the form of thin fibers 7, as well as beads which are not subjected to fiber formation. The mineral wool material formed is shredded by a gas stream into the spinning chamber 1 and further to the other end of the spinning chamber, the output end 8. The gas flow through the spinning chamber 1 is provided by a blowing means 9 located on the other side of the spinning chamber exit end. suction air through the spinning chamber 1.
Det er i denne sammenhæng selvfølgelig også muligt, i stedet for at anbringe blæseorganet 9 uden for indgangsenden 2, at blæse luft igennem spindekammeret. Det væsentlige er, at der 15 dannes en trykforskel imellem indgangsenden 2 og udgangsenden 8, så at der opnås en gasstrøm fra indgangsenden 2 imod udgangsenden 8. Det skal imidlertid understreges, at ved den viste foretrukne udførelsesform for indretningen ifølge opfindelsen, anvendes der ikke noget blæsemundstykke ved fibre-20 ringsaggregatet, da sådanne mundstykker har tendens til at øge medrivningen af perler i fiberstrømmen. For endvidere at frembringe forudsætninger for en turbulensfri gasstrømning igennem spindekammeret, er, som tidligere anført, indgangsenden 2 blevet tildannet så åben som mulig for i mindst mulig udstræk-25 ning at hindre gasstrømmens indtrængen i spindekammeret 1.In this context, of course, it is also possible, instead of placing the blower 9 outside the entrance end 2, to blow air through the spinning chamber. Essentially, a pressure difference is formed between the input end 2 and the output end 8 so that a gas flow is obtained from the input end 2 towards the output end 8. However, it should be emphasized that in the preferred embodiment of the device according to the invention shown, no blower nozzle at the fiber assembly as such nozzles tend to increase the entrainment of beads in the fiber flow. In addition, in order to provide the conditions for a turbulence-free gas flow through the spinning chamber, as previously stated, the input end 2 has been formed as open as possible to prevent, as far as possible, the gas flow's entry into the spinning chamber 1.
Det er i denne forbindelse også fordelagtigt at afrunde hjørner og kanter i gasstrømmens væg. Indgangsendens 2 åbne form åbner også mulighed for let anbringelse af et yderligere fibreri ngsaggregat, hvorved produktionskapaciteten øges. For at 30 fraskille perler og andet affaldsmateriale er der tilvejebragt en skakt 10 ved indgangsenden 2. I denne skakt falder affaldsmaterialet ned, hvorefter det transporteres bort. Det affaldsmateriale, som falder ned i skakten 10, hidrører dels fra par-tikelformigt materiale, som direkte i forbindelse med fiber-35 dannelsen ved fibreringsaggregatet falder ned i skakten, dels fra partikelformet materiale, som af gasstrømmen rives med ind i spindekammeret 1, hvor det imidlertid adskilles fra fibrene 7 og falder ned på kammerets bund, som består af et transport- 4In this connection, it is also advantageous to round corners and edges in the wall of the gas stream. The open shape of the input end 2 also allows for easy placement of a further fibrillation unit, thereby increasing the production capacity. In order to separate beads and other waste material, a shaft 10 is provided at the entrance end 2. In this shaft, the waste material falls down, after which it is transported away. The waste material falling into the shaft 10 derives partly from particulate material which falls directly into the shaft in connection with the fiber formation by the fibrating assembly and partly from particulate material which is teared into the spinning chamber 1 by the gas stream, where however, it is separated from the fibers 7 and falls to the bottom of the chamber, which consists of a transport 4
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bånd 11, der fører det opfangede, partikelformede materiale tilbage til skakten 10. Transportbåndet 11 bør være indrettet i hovedsagen vandret for at undgå, at også fibre opsamles på båndet.belt 11 which carries the trapped particulate material back to shaft 10. The conveyor belt 11 should be arranged substantially horizontally to prevent fibers from being collected on the belt as well.
55
Som omtalt tidligere skal ifølge opfindelsen gasstrømmen igennem spindekammeret 1, for at undgå turbulens og totdannelse, accelereres langs en betydelig del af dens bane igennem spindekammeret, hvorved gasstrømmens hastighed successivt tilta-10 ger. Denne acceleration og hastighedsøgning ved gasstrømmen iværksættes ved den foretrukne indretning ifølge opfindelsen ved, at spindekammerets 1 tværsnitsareal bliver mindre i retning imod dets udgangsende 8. Denne areal formindskelse kan opnås ved, at én eller flere af spindekammerets vægge konverge-15 rer i retning imod udgangsenden 8, og det foretrækkes i denne forbindelse at lade de to lodrette vægge 17 og 18 konvergere, således som vist i fig. 2.As discussed earlier, in order to avoid turbulence and tooth formation, the gas flow through the spinning chamber 1, according to the invention, must be accelerated along a substantial portion of its path through the spinning chamber, whereby the velocity of the gas flow gradually increases. This acceleration and velocity increase of the gas flow is effected by the preferred device according to the invention by reducing the cross-sectional area of the spinning chamber 1 towards its output end 8. This area reduction can be achieved by one or more of the walls of the spinning chamber converging towards the output end. 8, and in this connection it is preferred to allow the two vertical walls 17 and 18 to converge, as shown in FIG. 2nd
Den accelererende fiberindeholdende gasstrøm, som i hovedsagen 20 er befriet for partikelformet affaldsmateriale, rammer til sidst det gasgennemtrængelige opsamlingsbånd 12 ved spindekam-merets udgangsende 8, hvorved gasstrømmen passerer igennem opsamlingsbåndet, mens fibrene 7 afsættes på båndet og danner en måtte 13. Som følge af, at opsamlingsbåndet 12 er anbragt 25 omkring to roterende valser 14, 15, der i fig. 1 vises drevne i retning med uret, føres den dannede fibermåtte 13 successivt opad og ud af spindekammeret 1 for derefter at blive overført til et andet transportbånd 16 for videre behandling.The accelerating fiber-containing gas stream, which is substantially free of particulate waste material, eventually hits the gas-permeable collection belt 12 at the outlet end 8 of the spinning chamber, whereby the gas flow passes through the collection belt while the fibers 7 are deposited on the belt and form a mat 13. in that the collecting belt 12 is arranged about two rotating rollers 14, 15, which in FIG. 1 is shown driven in a clockwise direction, the formed fiber mat 13 is successively moved upward and out of the spinning chamber 1 and then transferred to another conveyor belt 16 for further processing.
30 For at man skal opnå den ønskede effekt ved opfindelsen, skal gasstrømmens hastighed øges med gennemsnitlig 5 til 65%, fortrinsvis ca. 25% under accelerationen igennem spindekammeret 1. Accelerationen bør være størst nærmest fibreringsaggregatet 5, dvs. ved indgangsenden 2. Endvidere skal gasstrømmen 35 accelereres langs så stor en del af strækningen imellem fibreringsaggregatet 5 og opsamlingsbåndet 12 som muligt og langs mindst 50% af denne strækning. I praksis har det vist sig hensigtsmæssigt at lade gasstrømmen accelerere langs ca. 70% afIn order to achieve the desired effect of the invention, the velocity of the gas flow must be increased by an average of 5 to 65%, preferably approx. 25% during the acceleration through the spinning chamber 1. The acceleration should be greatest closest to the fibrating assembly 5, ie. at the input end 2. Furthermore, the gas stream 35 must be accelerated along as much of the distance between the fibrating assembly 5 and the collecting band 12 as possible and along at least 50% of this distance. In practice, it has proved appropriate to allow the gas flow to accelerate along approx. 70% off
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7600463 | 1976-01-19 | ||
| SE7600463A SE396373C (en) | 1976-01-19 | 1976-01-19 | SET AND DEVICE FOR TRANSPORTING MINERAL FIBERS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK568276A DK568276A (en) | 1977-07-20 |
| DK155930B true DK155930B (en) | 1989-06-05 |
| DK155930C DK155930C (en) | 1989-10-30 |
Family
ID=20326753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK568276A DK155930C (en) | 1976-01-19 | 1976-12-17 | DEVICE FOR MANUFACTURING MINERAL FIBER MATS |
Country Status (9)
| Country | Link |
|---|---|
| CH (1) | CH614182A5 (en) |
| DE (1) | DE2656146B2 (en) |
| DK (1) | DK155930C (en) |
| FI (1) | FI60384C (en) |
| FR (1) | FR2338230A1 (en) |
| GB (1) | GB1516279A (en) |
| NL (1) | NL168894B (en) |
| NO (1) | NO141044C (en) |
| SE (1) | SE396373C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015142294A1 (en) * | 2014-03-17 | 2015-09-24 | Izoteh D.O.O. | Collecting chamber and fiber formation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2172153A (en) * | 1933-05-22 | 1939-09-05 | Benjamin C Mcclure | Process for fiberizing mineral compounds |
| US2750317A (en) * | 1953-10-08 | 1956-06-12 | Fred W Manning | Method and apparatus for making non-woven fabric |
| DK102375C (en) * | 1960-02-25 | 1965-08-16 | Saint Gobain | Method and apparatus for making wires or cords of fibers of thermoplastic materials, in particular of glass. |
| US3787194A (en) * | 1972-05-16 | 1974-01-22 | Johns Manville | Collection chamber for making mats of inorganic fibers |
-
1976
- 1976-01-19 SE SE7600463A patent/SE396373C/en not_active IP Right Cessation
- 1976-11-30 NO NO764088A patent/NO141044C/en unknown
- 1976-12-03 FI FI763496A patent/FI60384C/en not_active IP Right Cessation
- 1976-12-03 GB GB50547/76A patent/GB1516279A/en not_active Expired
- 1976-12-08 CH CH1539876A patent/CH614182A5/en not_active IP Right Cessation
- 1976-12-10 DE DE2656146A patent/DE2656146B2/en active Granted
- 1976-12-10 NL NL7613794.A patent/NL168894B/en not_active Application Discontinuation
- 1976-12-17 DK DK568276A patent/DK155930C/en not_active IP Right Cessation
- 1976-12-23 FR FR7638921A patent/FR2338230A1/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2172153A (en) * | 1933-05-22 | 1939-09-05 | Benjamin C Mcclure | Process for fiberizing mineral compounds |
| US2750317A (en) * | 1953-10-08 | 1956-06-12 | Fred W Manning | Method and apparatus for making non-woven fabric |
| DK102375C (en) * | 1960-02-25 | 1965-08-16 | Saint Gobain | Method and apparatus for making wires or cords of fibers of thermoplastic materials, in particular of glass. |
| US3787194A (en) * | 1972-05-16 | 1974-01-22 | Johns Manville | Collection chamber for making mats of inorganic fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| NO141044B (en) | 1979-09-24 |
| FR2338230A1 (en) | 1977-08-12 |
| NL168894B (en) | 1981-12-16 |
| DE2656146B2 (en) | 1980-02-21 |
| CH614182A5 (en) | 1979-11-15 |
| NO764088L (en) | 1977-07-20 |
| NL7613794A (en) | 1977-07-21 |
| SE396373C (en) | 1985-09-05 |
| DE2656146A1 (en) | 1977-07-21 |
| DK568276A (en) | 1977-07-20 |
| DE2656146C3 (en) | 1988-09-08 |
| FI60384C (en) | 1982-01-11 |
| DK155930C (en) | 1989-10-30 |
| SE396373B (en) | 1977-09-19 |
| SE7600463L (en) | 1977-07-20 |
| GB1516279A (en) | 1978-06-28 |
| FI763496A (en) | 1977-07-20 |
| NO141044C (en) | 1984-03-08 |
| FR2338230B1 (en) | 1980-08-08 |
| FI60384B (en) | 1981-09-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |