NO156160B - SPROEYTEHODE. - Google Patents
SPROEYTEHODE. Download PDFInfo
- Publication number
- NO156160B NO156160B NO791040A NO791040A NO156160B NO 156160 B NO156160 B NO 156160B NO 791040 A NO791040 A NO 791040A NO 791040 A NO791040 A NO 791040A NO 156160 B NO156160 B NO 156160B
- Authority
- NO
- Norway
- Prior art keywords
- mandrel
- spray head
- intermediate ring
- ring part
- nozzle jacket
- Prior art date
Links
- 239000007921 spray Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/695—Flow dividers, e.g. breaker plates
- B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
- B29C48/71—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows for layer multiplication
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/255—Flow control means, e.g. valves
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Moulding By Coating Moulds (AREA)
- Steroid Compounds (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
Description
Oppfinnelsen angår et sprøytehode for fremstilling av et plastrør som består av to i forhold til hverandre konsentriske delrør, eksempelvis for fremstilling av PVS-rør med tverr-rillet yttervegg og i hovedsaken glatt innervegg. The invention relates to a spray head for the production of a plastic pipe which consists of two concentric sub-pipes in relation to each other, for example for the production of PVS pipes with a cross-grooved outer wall and a mainly smooth inner wall.
De kjente sprøytehodeanordninger for dette for- The known spray head devices for this purpose
mål er tverr- eller skrå-sprøytehoder ved hvilke en sideveis inngående strøm av plastmateriale må strømme rundt en direkte ført, indre plaststrøm. Det er i denne forbindelse kjent å oppdele eller oppsplitte den sideveis inngående plast-strøm på en slik måte at den antar et U-formet tverrsnitt, for å føres forbi den indre plaststrøm og på nytt lukkes til ringform. Ved hjelp av denne kjente anordning er riktignok det hittil eksisterende problem med de høye dyna-miske trykk som opptrer ved middels viskøse til høyviskøse plastmaterialer, som for eksempel PVC, i stor utstrekning løst, men denne kjente anordning er likevel beheftet med den ulempe at lukningen av den oppsplittede plaststrøm til ringform, særlig ved bearbeidelse av PVC, bare lykkes i ufull-kommen grad. Langs lukkelinjen oppviser det ferdige rør inhomogeniteter som begunstiger et brudd i røret. Disse inhomogeniteter kan riktignok unngås ved tillegg av til-satsstoffer eller additiver, men slike additiver er ikke bare dyre, men endrer også de mekaniske spesifikasjoner for sluttproduktet på uønsket måte. targets are transverse or inclined injection heads at which a laterally incoming stream of plastic material must flow around a directly routed internal plastic stream. In this connection, it is known to divide or split up the laterally incoming plastic flow in such a way that it assumes a U-shaped cross-section, to be led past the internal plastic flow and closed again into a ring shape. With the help of this known device, the hitherto existing problem with the high dynamic pressures that occur with medium-viscous to highly viscous plastic materials, such as PVC, has to a large extent been solved, but this known device is still burdened with the disadvantage that the closure of the split plastic flow into ring form, especially when processing PVC, only succeeds to an imperfect degree. Along the closing line, the finished pipe exhibits inhomogeneities that favor a break in the pipe. These inhomogeneities can indeed be avoided by the addition of additives or additives, but such additives are not only expensive, but also change the mechanical specifications of the final product in an undesirable way.
Formålet med oppfinnelsen er således å videreut-vikle en sprøytehodeanordning av den innledningsvis angitte type på en slik måte at ovenstående ulemper unngås, og spesielt en feilfri bearbeidelse av PVC til dobbeltrør er mulig. The purpose of the invention is thus to further develop a spray head device of the type indicated at the outset in such a way that the above disadvantages are avoided, and in particular error-free processing of PVC into double pipes is possible.
Ifølge oppfinnelsen oppnås ovennevnte formål ved According to the invention, the above purpose is achieved by
at det er anordnet bare ett eneste, direkte sprøytehode som oppviser en dor, en mellomringdel og en dysemantel, idet doren er utformet som massiv dor, og at mellomringdelen, that there is only one, direct spray head that has a mandrel, an intermediate ring part and a nozzle jacket, the mandrel being designed as a solid mandrel, and that the intermediate ring part,
som deler ringrommet mellom doren og dysemantelen i to fullstendig fra hverandre adskilte ringkanaler, oppviser en skjæredel, et holdesteg og en førings- hhv. formdel. which divides the annular space between the mandrel and the nozzle jacket into two completely separated annular channels, has a cutting part, a holding step and a guiding resp. form part.
Kjernen i oppfinnelsen består således i at én The core of the invention thus consists in one
og samme massestrøm ved hjelp av ett eneste, direkte sprøyte-hode oppdeles i to konsentriske, fra hverandre fullstendig and the same mass flow by means of a single, direct spray head is divided into two concentric, completely separated from each other
adskilte, intakte massestrømmer uten endring av den aksiale strømningsretning og uten de forannevnte ulemper. separate, intact mass flows without changing the axial flow direction and without the aforementioned disadvantages.
Ved en fordelaktig utførelse av oppfinnelsen er mellomringdelen forsynt med minst én tilførselskanal for et trykkmedium, såsom trykkluft, idet tilførselskanalen forløper gjennom'holdesteget og fører til en tilkoplingsstuss. In an advantageous embodiment of the invention, the intermediate ring part is provided with at least one supply channel for a pressure medium, such as compressed air, the supply channel running through the holding step and leading to a connection socket.
For styring av materialstrømmenes utgangshastighet fra sprøytehodet er det fordelaktig at doren og dysemantelen i det minste i området for mellomringdelen er forsynt med en respektiv oppvarmings- og/eller kjølteanordning. For controlling the output speed of the material flows from the spray head, it is advantageous that the mandrel and the nozzle jacket, at least in the area of the intermediate ring part, are provided with a respective heating and/or cooling device.
Oppfinnelsen skal beskrives nærmere i det følgende i forbindelse med et utførelseseksempel under henvisning til tegningen som viser et skjematisk, langsgående delsnitt av et sprøytehode ifølge oppfinnelsen som er bestemt for sprøyting av to innbyrdes konsentriske rør. The invention shall be described in more detail in the following in connection with an embodiment with reference to the drawing showing a schematic, longitudinal section of a spray head according to the invention which is intended for spraying two mutually concentric pipes.
Ved det viste sprøytehode 1 dreier det seg om et såkalt direkte sprøytehode ved hvilket plaststrømmen, for eksempel PVC, føres i retning av sprøytehodets akse. Sprøy-tehodet omfatter den vanlige dor 2 og en dorbærer 3 med formromskanaler eller steg 4. Dessuten består sprøyte-hodet av en dysemantel 5 og en etter dorbæreren 3 anordnet mellomringdel 6. Dennes oppgave er å oppdele plaststrømmen i to i seg selv lukkede, fullstendig fra hverandre adskilte, intakte plaststrømmer. For dette formål oppviser mellomringdelen en skjæredel 7 med en ringformet skjærekant 8 og til denne i strømretningen tilsluttende ledeflater 9 for de to materialstrømmer. The spray head 1 shown is a so-called direct spray head in which the flow of plastic, for example PVC, is directed in the direction of the spray head's axis. The injection head comprises the usual mandrel 2 and a mandrel carrier 3 with mold space channels or steps 4. The injection head also consists of a nozzle jacket 5 and an intermediate ring part 6 arranged after the mandrel carrier 3. Its task is to divide the plastic flow into two inherently closed, completely separate, intact plastic streams. For this purpose, the intermediate ring part has a cutting part 7 with an annular cutting edge 8 and guide surfaces 9 for the two material flows connected to this in the flow direction.
Videre består mellomringdelen 6 av en mellomstykke-holder eller holdesteg 10 som er utformet som en dorbærer (torpedo) og med hvis steg 13 holdesteget 10 holdes mot dysemantelen 5. De to materialstrømmer føres frem til de ringformede utgangsåpninger 11 og 12 gjennom en førings-hhv. formdel 14. Denne førings- eller formdel er utformet som et konsentrisk til doren 2 forløpende rotasjonshullegeme. På stedet for utgangsåpningene 11, 12 skal utgangshastig-hetene for de to konsentriske delstrømmer være like store. Bortsett fra at delstrømmenes hastighet også er bestemt Furthermore, the intermediate ring part 6 consists of an intermediate piece holder or holding step 10 which is designed as a mandrel carrier (torpedo) and with whose step 13 the holding step 10 is held against the nozzle jacket 5. The two material streams are led to the annular exit openings 11 and 12 through a guide . mold part 14. This guide or mold part is designed as a rotary hole body extending concentrically to the mandrel 2. At the location of the exit openings 11, 12, the exit velocities for the two concentric partial flows must be equal. Except that the speed of the partial currents is also determined
av innstillingen av lede- eller styreflatene 9 i til- of the setting of the guide or control surfaces 9 in the
strømningskanalene, blir denne like utgangshastighet hen-siktsmessig oppnådd ved hjelp av oppvarmings- og/eller kjøleanordninger. Disse er anordnet i det minste i området for mellomringdelen 6. På tegningen er en oppvarmings-og/eller kjøleanordning 15 vist påsatt på dysemantelen 5, og en oppvarmings- og/eller kjøleanordning 16 er vist innsatt i doren 2. the flow channels, this equal output speed is expediently achieved by means of heating and/or cooling devices. These are arranged at least in the area of the intermediate ring part 6. In the drawing, a heating and/or cooling device 15 is shown attached to the nozzle jacket 5, and a heating and/or cooling device 16 is shown inserted in the mandrel 2.
Ved fremstillingen av rør med tverrillet yttervegg og i hovedsaken glatt innervegg er det etter sprøyte-hodet 1 anordnet en bearbeidelses- eller formemaskin. Denne er av kjent type ikke vist da den ikke er vesentlig for oppfinnelsen . In the production of pipes with cross-grooved outer wall and essentially smooth inner wall, a processing or shaping machine is arranged after the spray head 1. This is of a known type and is not shown as it is not essential to the invention.
Denne formemaskin består av en propp på hvilken det indre rør påtrekkes. Innarbeidelsen av tverr-rillene i det ytre rør skjer ved hjelp av to formbakkearekker. This molding machine consists of a stopper onto which the inner tube is pulled. The incorporation of the transverse grooves in the outer tube takes place with the help of two rows of form trays.
Etter de to kjente bearbeidelsesmetoder hersker det først over- eller undertrykk i det rom som er begrenset av det indre rør, proppen og sprøytehodets frontside. For fremstilling av disse trykkforhold er doren 2 utformet med en kanal 17 som over et torpedosteg 4 er ført til en tilkoplingsstuss 18. According to the two known processing methods, overpressure or underpressure first prevails in the space limited by the inner tube, the stopper and the front side of the spray head. To produce these pressure conditions, the mandrel 2 is designed with a channel 17 which is led over a torpedo step 4 to a connecting piece 18.
Ved begge fremstillingsmetoder er det nødvendig In both production methods it is necessary
å tilføre støtteluft til hulrommet mellom det indre og det ytre rør, hvilket ved sprøytehodet ifølge oppfinnelsen kan skje over én eller flere i mellomringdelen forløpende kanaler 19. Disse kanaler er over holdesteget 10 forbundet med tilkoplingsstusser 20. to supply support air to the cavity between the inner and the outer tube, which in the case of the spray head according to the invention can take place via one or more channels 19 running in the intermediate ring part. These channels are connected via the holding step 10 with connecting pieces 20.
Sprøytehodet ifølge oppfinnelsen er særlig egnet for forming av PVC og sikrer fremstilling, uten lukkesømmer og herav betingede inhomogeniteter, av to innbyrdes konsentriske rør som med hensyn til trykksikkerhet tillater fremstilling av i vidtgående grad forbedrede sluttproduk-ter, som for eksempel tverr-rillede dreneringsrør med glatt innervegg. The spray head according to the invention is particularly suitable for forming PVC and ensures the production, without closing seams and resulting inhomogeneities, of two mutually concentric pipes which, with regard to pressure safety, allow the production of vastly improved end products, such as, for example, cross-grooved drainage pipes with smooth inner wall.
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0223278A AT374737B (en) | 1978-03-30 | 1978-03-30 | SPRAY HEAD |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO791040L NO791040L (en) | 1979-10-02 |
| NO156160B true NO156160B (en) | 1987-04-27 |
| NO156160C NO156160C (en) | 1987-08-05 |
Family
ID=3530477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO791040A NO156160C (en) | 1978-03-30 | 1979-03-29 | SPROEYTEHODE. |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS54135858A (en) |
| AT (1) | AT374737B (en) |
| DE (1) | DE2911833C3 (en) |
| FI (1) | FI791002A (en) |
| FR (1) | FR2421048B1 (en) |
| IT (1) | IT1165652B (en) |
| NL (1) | NL190957C (en) |
| NO (1) | NO156160C (en) |
| SE (1) | SE433057B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4770618A (en) * | 1986-01-15 | 1988-09-13 | Lupke Manfred Arno Alfred | Extrusion die for two-ply plastic tubing |
| EP0243516A1 (en) * | 1986-04-28 | 1987-11-04 | UNICOR GmbH Rahn Plastmaschinen | Apparatus for the extrusion of a double-wall plastic pipe |
| DE4128654C2 (en) * | 1991-08-29 | 1995-05-18 | Wolfgang Mayer | Multi-layer plastic conduit and process for its manufacture |
| DE19640928A1 (en) * | 1996-10-04 | 1998-04-09 | Ralph Peter Dr Ing Hegler | Device for the production of plastic composite pipes |
| DE19835189C2 (en) | 1998-08-04 | 2001-02-08 | Unicor Rohrsysteme Gmbh | Device for the continuous production of seamless plastic pipes |
| DE19956880B4 (en) * | 1999-11-26 | 2004-07-08 | Henco Industries Nv | Plastic tube with surrounding finned tube |
| DE102006037885A1 (en) | 2006-08-11 | 2008-02-14 | Unicor Gmbh | Spray head for a corrugator |
| DE102010046501B4 (en) | 2010-09-24 | 2013-12-12 | Unitec Gmbh Technische Entwicklungen | Device or tool for the continuous production of flexible single or multi-layer and material-saving plastic corrugated pipes in conjunction with corrugated tube forming machines and rotating molds. |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1154035A (en) * | 1956-06-26 | 1958-04-01 | Plax Corp | Improvements in methods and apparatus for forming tubes or multilayer sheets of thermoplastic material |
| US3372429A (en) * | 1963-03-04 | 1968-03-12 | Kato Seisakusho Kk | Manufacture of double-walled hollow plastic product |
| GB994567A (en) * | 1964-04-30 | 1965-06-10 | Gnii Plasticheskykh Mass | Double-wall tube and die for extruding the same |
| US3280430A (en) * | 1965-05-24 | 1966-10-25 | Acme Hamilton Mfg Corp | Apparatus for making corrugated plastic tubing |
| AT325299B (en) * | 1967-02-27 | 1975-10-10 | Hegler Wilhelm | DEVICE FOR MANUFACTURING TUBES FROM THERMOPLASTIC PLASTIC |
| US3758354A (en) * | 1969-10-18 | 1973-09-11 | Gunze Kobunshi Kogyo Co Ltd | Manufacture of multi ply board of thermoplastic material |
| DE2413877C3 (en) * | 1974-03-22 | 1979-02-01 | Hegler, Wilhelm, 8730 Bad Kissingen | Extrusion head for continuously sheathing a pipe or cable |
| DE2461340C3 (en) * | 1974-12-24 | 1980-10-23 | Hermann Dipl.-Ing. 7000 Stuttgart Staehle | Injection head for blow molding machines for hollow parts for the production of two hollow strands made of thermoplastic material |
| NL7500386A (en) * | 1975-01-13 | 1976-07-15 | Wavin Bv | METHOD AND DEVICE FOR MANUFACTURING A PLASTIC TUBE WITH ELONGATED CHANNELS IN THE WALL. |
| JPS534214A (en) * | 1976-07-01 | 1978-01-14 | Tokan Kogyo Co Ltd | Multiiwalled pipe of synthetic resin and forming method |
| FR2397933A1 (en) * | 1977-07-22 | 1979-02-16 | Usinage Tubes Pour Electr | Die and mandrel for extruding corrugated tubing - with a smooth internal lining, by co:extrusion of the coaxial components |
-
1978
- 1978-03-30 AT AT0223278A patent/AT374737B/en not_active IP Right Cessation
-
1979
- 1979-03-26 NL NL7902354A patent/NL190957C/en not_active IP Right Cessation
- 1979-03-26 DE DE2911833A patent/DE2911833C3/en not_active Expired - Lifetime
- 1979-03-26 FI FI791002A patent/FI791002A/en not_active Application Discontinuation
- 1979-03-27 SE SE7902743A patent/SE433057B/en not_active IP Right Cessation
- 1979-03-29 NO NO791040A patent/NO156160C/en unknown
- 1979-03-29 IT IT67653/79A patent/IT1165652B/en active
- 1979-03-30 FR FR7908045A patent/FR2421048B1/en not_active Expired
- 1979-03-30 JP JP3825379A patent/JPS54135858A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2421048A1 (en) | 1979-10-26 |
| NO791040L (en) | 1979-10-02 |
| SE433057B (en) | 1984-05-07 |
| DE2911833A1 (en) | 1979-10-04 |
| DE2911833C3 (en) | 1994-07-07 |
| NL190957C (en) | 1994-11-16 |
| IT1165652B (en) | 1987-04-22 |
| NL190957B (en) | 1994-06-16 |
| AT374737B (en) | 1984-05-25 |
| DE2911833C2 (en) | 1988-07-14 |
| JPS6260256B2 (en) | 1987-12-15 |
| SE7902743L (en) | 1979-10-01 |
| ATA223278A (en) | 1983-10-15 |
| FR2421048B1 (en) | 1985-01-25 |
| NL7902354A (en) | 1979-10-02 |
| NO156160C (en) | 1987-08-05 |
| JPS54135858A (en) | 1979-10-22 |
| FI791002A (en) | 1979-10-01 |
| IT7967653A0 (en) | 1979-03-29 |
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