SE433057B - SPRAY HEAD FOR MANUFACTURE OF ONE OF TWO INBOARD CONCENTRIC PARTS CONSISTING OF PLASTROR - Google Patents

SPRAY HEAD FOR MANUFACTURE OF ONE OF TWO INBOARD CONCENTRIC PARTS CONSISTING OF PLASTROR

Info

Publication number
SE433057B
SE433057B SE7902743A SE7902743A SE433057B SE 433057 B SE433057 B SE 433057B SE 7902743 A SE7902743 A SE 7902743A SE 7902743 A SE7902743 A SE 7902743A SE 433057 B SE433057 B SE 433057B
Authority
SE
Sweden
Prior art keywords
mandrel
spray head
head according
designed
manufacture
Prior art date
Application number
SE7902743A
Other languages
Swedish (sv)
Other versions
SE7902743L (en
Inventor
F Alber
Original Assignee
Cincinnati Milacron Austria
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cincinnati Milacron Austria filed Critical Cincinnati Milacron Austria
Publication of SE7902743L publication Critical patent/SE7902743L/en
Publication of SE433057B publication Critical patent/SE433057B/en

Links

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)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Steroid Compounds (AREA)

Description

790274-3-9 l5 40 additiv men dylika additiv är inte bara kostnadskrävande utan ändrar även slutproduktens mekaniska egenskaper på icke önsk- värt sätt. 790274-3-9 l5 40 additives but such additives are not only costly but also change the mechanical properties of the end product in an undesirable manner.

Uppfinningen har till uppgift att vidare utveckla ett sprut- huvud av det inlednigsvis Omnämnda slaget på sådant sätt att ovannämnda olägenheter undvikes och att speciellt en tillfreds- ställande bearbetning av PVC till dubbelrör är möjlig. Enligt uppfinningen uppnås detta därigenom att endast ett enda rakt spruthuvud anordnas, vilket i huvudsak består av ett munstyckek en mellandel och en dorn, varvid mellandelen uppdelar den tillförda plastströmmen i två koncentriska plastströmmar, varvid mellandelen på lämpligt sätt fasthålles vid munstycket.The object of the invention is to further develop a spray head of the type mentioned in the introduction in such a way that the above-mentioned inconveniences are avoided and that in particular a satisfactory processing of PVC into double pipes is possible. According to the invention, this is achieved by arranging only a single straight spray head, which essentially consists of a nozzle, an intermediate part and a mandrel, the intermediate part dividing the supplied plastic stream into two concentric plastic streams, the intermediate part being suitably held at the nozzle.

Det karakteristiska för uppfinningen består således däri, att en och samma massaström uppdelas i två koncentriska, helt från varandra skilda intakta rörformade massaströmmar.The characteristic of the invention thus consists in that one and the same mass stream is divided into two concentric, completely different intact tubular mass streams.

Enligt en vidareutveckling av uppfinningen består mellandelen av en skärdel, en mellanstyckshållare och en styr- resp. formdel.According to a further development of the invention, the intermediate part consists of a cutting part, an intermediate piece holder and a guide resp. form part.

På särskilt fördelaktigt sätt kan låga uppdämningstryck enligt uppfinningen uppnås genom att skärdelen är utförd med en ring- formad skärkant och sig därefter i strömningsriktning anslutande ledytor för materialströmmarna. För att styra materialströmmarnas utmatningshastighet ur spruthuvudet kan enligt uppfinningen i dornen och i resp. vid munstycket åtminstone närmast mellandelen vara anordnad en uppvärmnings- och/eller kylanordning.In a particularly advantageous manner, low dam pressures according to the invention can be achieved in that the cutting part is made with an annular cutting edge and subsequently connecting joint surfaces for the material flows in the direction of flow. In order to control the discharge velocity of the material streams from the spray head, according to the invention in the mandrel and in resp. at the nozzle at least closest to the intermediate part a heating and / or cooling device must be arranged.

Uppfinningen skall nu förklaras närmare i anslutning till bifogade ritning, som visar ett spruthuvud enligt uppfinningen för sprutning av två koncentriska rör i ett schematiskt del- längdsnitt.The invention will now be explained in more detail in connection with the accompanying drawing, which shows a spray head according to the invention for spraying two concentric pipes in a schematic partial longitudinal section.

Vid det återgivna spruthuvudet l rör det sig om ett s.k. rakt spruthuvud, där plastströmmen, t.ex. PVC, tillföres i spruthu- vudets längdaxel. Med 2 har betecknats den konventionella dornen, 3 är dornhållaren med tvärstycken 4. Vidare uppvisar spruthuvudet ett munstycke 5 och en efter dornhållaren 3 anordnad mellandel 6. Den sistnämndas uppgift består i att uppdela plastströmmen i två i sig slutna, helt från varandra skilda l0 l5 40 7902743~äi intakta plastströmmar. För detta ändamål uppvisar den en skär- del 7 med en ringformad skärkant 8 och sig därefter i ström- ningsriktning anslutande ledytor 9 för de båda materialström- maffia. .The spray head 1 shown is a so-called straight spray head, where the plastic stream, e.g. PVC, is supplied in the longitudinal axis of the spray head. Denoted by 2 is the conventional mandrel, 3 is the mandrel holder with crosspieces 4. Furthermore, the spray head has a nozzle 5 and an intermediate part 6 arranged after the mandrel holder 3. 40 7902743 ~ in intact plastic streams. For this purpose, it has a cutting part 7 with an annular cutting edge 8 and then joins connecting surfaces 9 for the two material flow mafia in the direction of flow. .

Vidare består mellandelen av en mellanstyckshållare 10, som är utförd som en dornhâllare (torped) och med vars tvärstycken 13 mellanstycket 6 fasthålles vid munstycket 5.Furthermore, the intermediate part consists of a spacer holder 10, which is designed as a mandrel holder (torpedo) and with whose crosspieces 13 the spacer 6 is held to the nozzle 5.

De båda materialströmmarna ledes genom en styr- resp. formdel l4 fram till de ringformade utmatningsöppningarna ll och 12.The two material streams are led through a control resp. mold part 14 up to the annular discharge openings 11 and 12.

Denna styr- resp. formdel är utförd som en koncentriskt med dornen 2 förlöpande ihålig rotationskropp. Vid utmatningsöpp- ningarna ll, 12 skall de båda koncentriska rörens utmatnings- hastigheter vara lika stora. Bortsett från att de båda del- strömmarnas hastighet påverkas av ledytornas 9 vinkelläge i påströmningskanalerna, uppnås denna lika utmatningshastighet lämpligen genom värmeelement och/eller kylanordningar. Sådana finns åtminstone närmast mellandelen 6. På ritningen visas ett värmeelement och/eller en kylanordning 15 på munstycket och en likadan anordning 16 insatt i dornen 2.This control resp. mold part is designed as a hollow rotating body extending concentrically with the mandrel 2. At the discharge openings 11, 12, the discharge velocities of the two concentric tubes must be equal. Apart from the fact that the speed of the two substreams is affected by the angular position of the hinge surfaces 9 in the inflow channels, this equal discharge speed is suitably achieved by heating elements and / or cooling devices. These are located at least closest to the intermediate part 6. The drawing shows a heating element and / or a cooling device 15 on the nozzle and a similar device 16 inserted in the mandrel 2.

Vid tillverkning av rör med tvärkorrugerad yttervägg och i huvudsak slät innervägg följer efter spruthuvudet 1 en form- maskin. Denna är av i och för sig känt slag och inte väsentlig för uppfinningen, varför den inte återgivits.When manufacturing pipes with a transversely corrugated outer wall and a substantially smooth inner wall, a molding machine follows the spray head 1. This is of a kind known per se and is not essential to the invention, for which reason it has not been reproduced.

Denna korrugeringsmaskin består av en propp, som det inre röret träs på. Inarbetningen av tvärkorrugeringen i det yttre röret sker genom två formkäftrader. Efter de båda kända formningsför- farandena råder i det av det inre röret, proppen och spruthuvu- dets kortsida begränsade rummet omväxlande ett över- eller undertryck. För att åstadkomma dessa tryckförhâllanden har dornen en kanal 17, vilken via ett torpedtvärstycke 4 leder till en anslutningsstuts 18.This corrugation machine consists of a plug, on which the inner tube is threaded. The incorporation of the transverse corrugation in the outer pipe takes place through two rows of mold jaws. After the two known forming methods, an overpressure or underpressure prevails in the space limited by the short side of the inner tube, the plug and the spray head. To achieve these pressure conditions, the mandrel has a channel 17, which via a torpedo crosspiece 4 leads to a connecting piece 18.

Vid båda tillverkningsförfarandena är det nödvändigt att till- föra hålrummet mellan det inre och yttre röret s.k. stödluft, vilket vid spruthuvudet enligt uppfinningen kan ske via en eller flera i mellandelen 6 Eörlöpande kanaler l9. Dessa kani- 79027 43-9 lO ler 19 är via torpedtvärstyckena 10 förbundna med anslutnings- stutsar 20.In both manufacturing methods, it is necessary to supply the cavity between the inner and outer tube so-called support air, which at the spray head according to the invention can take place via one or more in the intermediate part 6. These channels 19 are connected via the torpedo cross pieces 10 to connecting spouts 20.

Spruthuvudet enligt uppfinningen lämpar sig speciellt för bear- betning av PVC och säkerställer en från sömmar och därigenom betingade inhomogeniteter fri tillverkning av två koaxiella rör, vilket medger tillverkning av beträffande trycksäkerhet avsevärt förbättrade slutprodukter såsom t.ex. tvärkorrugerade dräneringsrör med slät insida.The spray head according to the invention is particularly suitable for processing PVC and ensures a free manufacture of two coaxial pipes from seams and thereby conditioned inhomogeneities, which allows the manufacture of considerably improved end products such as e.g. cross-corrugated drainage pipes with smooth inside.

Claims (8)

1. 0 15 20 25 30 7902745-9 PATENTKRAV l. Spruthuvud för tillverkning av ett av två inbördes koncentriska delrör bestående plaströr, exempelvis för till- verkning av PVC-rör med tvärkorrugerad yttervägg och i huvudsak slät innervägg, k ä n n e t e c k n a t därav, att endast ett enda rakt spruthuvud (l) är anordnat, att spruthuvudet (l) i huvudsak består av en dorn (2), en mellandel (6) och ett munstycke (5), att dornen (2) är ut- förd såsom massiv dorn och att den rummet mellan dornen (2) och spruthuvudhusinnervägg i två helt från varandra skilda kanaler uppdelande mellandelen (6) består av en skärdel (7), en mellanstyckshållare (10) och en styr- resp formdel (14).1. 0 15 20 25 30 7902745-9 CLAIMS 1. Spray head for the manufacture of a plastic pipe consisting of two mutually concentric sub-pipes, for example for the manufacture of PVC pipes with cross-corrugated outer wall and substantially smooth inner wall, characterized in that only a single straight spray head (1) is provided, that the spray head (1) essentially consists of a mandrel (2), an intermediate part (6) and a nozzle (5), that the mandrel (2) is designed as a solid mandrel and that the space between the mandrel (2) and the spray head housing inner wall in two completely separate channels dividing the intermediate part (6) consists of a cutting part (7), an intermediate piece holder (10) and a guide and mold part (14). 2. Spruthuvud enligt krav l, k ä n n e t e c k n a t därav, att mellandelen (6) är utförd med minst en kanal (19) för ettSpray head according to claim 1, characterized in that the intermediate part (6) is made with at least one channel (19) for a 3. Spruthuvud enligt krav l eller 2, tryckmedium, t ex tryckluft. k ä n n.e - t e c k n a t därav, att dornen (2) på i och för sig känt sätt är utförd med en strömningskanal (17).Syringe head according to claim 1 or 2, pressure medium, eg compressed air. characterized in that the mandrel (2) is designed in a manner known per se with a flow channel (17). 4. Spruthuvud enligt krav l, 2 eller 3, k ä n n e - t e c k munstycket (5) åtminstone närmast mellandelen (6) är an- n a t därav, att i dornen (2) och i resp vid ordnat var sitt värmeelement och/eller var sin kylanordning (15, 16).Syringe head according to Claim 1, 2 or 3, characterized in that the nozzle (5) is at least closest to the intermediate part (6), is different in that in the mandrel (2) and in the respective width, respectively, its heating element and / or each its cooling device (15, 16). 5. Spruthuvud enligt krav 4, n a t därav, att skärdelen (7) är försedd med en ringformad k ä n n e t e c k - skärkant (8) och sig därefter i strömningsriktning anslu- tande ledytor (9) för materialströmmarna (B, C).Syringe head according to Claim 4, in that the cutting part (7) is provided with an annular characteristic cutting edge (8) and then connecting surfaces (9) of the material streams (B, C) connecting in the flow direction. 6. Spruthuvud enligt krav 5, k ä n n e t e c k - n a t därav, att mellanstyckshållaren (l0) är utförd liknande en dornbärare (tvärstycke l3).Syringe head according to claim 5, characterized in that the spacer holder (l0) is designed similar to a mandrel carrier (crosspiece l3). 7. Spruthuvud enligt krav 5 eller 6, k ä n n e - t e c k n a t därav, att mellanstyckshållaren (10) uppvisar en med en anslutningsstuts (20) förbunden tryck- (19).Syringe head according to Claim 5 or 6, characterized in that the intermediate piece holder (10) has a pressure (19) connected to a connecting nozzle (20). 8. Spruthuvud enligt krav 1, medelstilledning k ä n n e t e c k - 7902745-9 n a t därav, att styr- resp formdelen (14) är utförd såsom en koncentriskt med dornen (2) förlöpande ihålig rotationskropp.8. A spray head according to claim 1, a medium position line characterized in that the guide or mold part (14) is designed as a hollow rotating body extending concentrically with the mandrel (2).
SE7902743A 1978-03-30 1979-03-27 SPRAY HEAD FOR MANUFACTURE OF ONE OF TWO INBOARD CONCENTRIC PARTS CONSISTING OF PLASTROR SE433057B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0223278A AT374737B (en) 1978-03-30 1978-03-30 SPRAY HEAD

Publications (2)

Publication Number Publication Date
SE7902743L SE7902743L (en) 1979-10-01
SE433057B true SE433057B (en) 1984-05-07

Family

ID=3530477

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7902743A SE433057B (en) 1978-03-30 1979-03-27 SPRAY HEAD FOR MANUFACTURE OF ONE OF TWO INBOARD CONCENTRIC PARTS CONSISTING OF PLASTROR

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)

* Cited by examiner, † Cited by third party
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.

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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

Also Published As

Publication number Publication date
DE2911833C2 (en) 1988-07-14
FI791002A (en) 1979-10-01
JPS54135858A (en) 1979-10-22
SE7902743L (en) 1979-10-01
JPS6260256B2 (en) 1987-12-15
NO156160C (en) 1987-08-05
FR2421048B1 (en) 1985-01-25
AT374737B (en) 1984-05-25
IT1165652B (en) 1987-04-22
FR2421048A1 (en) 1979-10-26
NL190957B (en) 1994-06-16
DE2911833A1 (en) 1979-10-04
NO156160B (en) 1987-04-27
DE2911833C3 (en) 1994-07-07
IT7967653A0 (en) 1979-03-29
NL190957C (en) 1994-11-16
NO791040L (en) 1979-10-02
ATA223278A (en) 1983-10-15
NL7902354A (en) 1979-10-02

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