WO1984003066A1 - Procedure for manufacturing a thermally insulating sheath or duct for a pipe or pipes - Google Patents

Procedure for manufacturing a thermally insulating sheath or duct for a pipe or pipes Download PDF

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Publication number
WO1984003066A1
WO1984003066A1 PCT/FI1984/000013 FI8400013W WO8403066A1 WO 1984003066 A1 WO1984003066 A1 WO 1984003066A1 FI 8400013 W FI8400013 W FI 8400013W WO 8403066 A1 WO8403066 A1 WO 8403066A1
Authority
WO
WIPO (PCT)
Prior art keywords
surface layer
procedure
foam
tube
calibration
Prior art date
Application number
PCT/FI1984/000013
Other languages
French (fr)
Inventor
Johan Brenner
Helge Lindstroem
Original Assignee
Neste Oy
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 Neste Oy filed Critical Neste Oy
Priority to GB08425636A priority Critical patent/GB2146286A/en
Publication of WO1984003066A1 publication Critical patent/WO1984003066A1/en
Priority to DK482484A priority patent/DK482484A/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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • B29C44/322—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being elongated inserts, e.g. cables
    • B29C44/324—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being elongated inserts, e.g. cables the preformed parts being tubular or folded to a tubular shape
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting

Definitions

  • the present invention concerns a procedure for manufacturing a tube of insulating material comprising one or several inner tubes, foamed plastic insulation and a surface layer of plastic, in said procedure foaming substance being conducted to encircle the inner tube, and similarly plastic raw material for forming a surface layer, and around the inner tube are produced a foamed plastic insulation and a surface layer simultaneously in one step, and in said procedure the surface layer being cooled to desired dimension in a calibration means, the surface being urged against the inner surface of this means by the aid of a calibration pressure.
  • district heating elements are manufactured by two different procedures.
  • the so-called inside foaming procedure a thin-walled PEH tube is first manufactured.
  • a steel tube is fixed with the aid of supporting props.
  • the intervening space between the PEH and the steel tube is then filled with urethane foam.
  • the foam is coated with polyethylene.
  • insulation ducts have been manufactured, the foaming being applied around a glass fibre-reinforced polyester tube.
  • the foam is coated as above.
  • steel pipes or tubes of various size can be inserted in the polyester tube.
  • a means is also known in the art by which a plastic-coated tube of insulating material can be manufactured in a continuous extrusion process.
  • the inner tube may also be manufactured by extrusion, and the plastic foam is sprayed in between the inner and surface layers in connection with the extrusion process.
  • the inner tube can be coated with a foam layer and a plastic surface layer in one step by the aid of an extrusion press.
  • the foaming nozzle of the means is disposed to follow after the surface layer nozzle in such way that the plastic foam insulation can be injected into the space defined by the surface layer and the inner tube, between the nozzle head and the calibration means.
  • the calibration means primarily a vacuum calibration means, has been disposed at a distance from the surface layer nozzle, so that the surface layer might cool down to a suitable calibration temperature.
  • the drawbacks of the means of the Finnish patent No. 54878 include the site of the foaming nozzle as late as after the surface layer nozzle in the direction of travel of the tube, whereby an empty space is formed behind the foaming nozzle. If the air in the empty space is entrained with the foam, a vacuum is produced within the surface layer immediately after the nozzle. This will cause the soft surface layer to be drawn against the foaming nozzle, and the production comes to a stop.
  • the empty space may also be filled with hardened foam, which has a detrimental effect on the quality of the surface layer.
  • the object of the invention is to achieve an improvement in the procedures known in the art.
  • a more detailed object of the invention is to teach a procedure in which the foaming and the manufacturing of the outer tube can be accomplished simultaneously in one step, around the inner tube, and in which no vacuum calibration is required. It is also an object of the present invention to provide a procedure which is equally suitable for a tube made of steel as for one of plastic.
  • the objects of the invention are gained by a procedure which is mainly characterized in that the calibration pressure is generated by the aid of the foaming, release of the calibration pressure being prevented by the plug which the foam form as it solidifies.
  • the invention makes possible for instance a procedure for manufacturing district heating elements by which the foaming and the manufacturing of the outer skin can be accomplished simultaenously in one step, around a steel or polyester tube.
  • the procedure of the invention also no vacuum calibration is needed, as was the case e.g. in the means of the Finnish patent No. 54878.
  • the procedure of the invention is equally well suited for inner tubes of steel and of plastic.
  • foaming material in the procedure of the invention any such foams can be used which have characteristics, such as heat tolerance and insulating capacity, appropriate to the purpose.
  • a suitable foaming material is for instance polyurethane.
  • the means employed in the procedure of the invention has been indicated in general with the reference numeral 10.
  • the means 10 comprises a plastic tube nozzle 11 provided with a hollow mandrel, a guiding support 12 for the inner tube 17, provided with centering facility, a combined inner tube guiding and foam nozzle body 13, an external water-cooled calibration tube 14, tubes 15 supplying the foam materials, and supply ducts 19 for the plastic raw material of the surface layer.
  • the plastic surface layer of the insulating tube manufactured by the procedure of the invention is indicated by reference numeral 16 and the-foam plastic insulation, by reference numeral 18.
  • a foam plastic insulation 18 and a surface layer 16 are formed around the inner tube 17 simultaneously in one work step.
  • a calibration pressure is produced which can be controlled by regulating the raw material supply and the temperature of the foam raw materials.
  • Outside cooling 14 is applied to cool the surface layer 16 at correct dimension. As it solidifies, the foam forms a plug which prevents the calibration pressure from being released.
  • the running speed, the foam constituents and the length of the calibration tube 14 have to be selected so that the foam has become solid by the time the element emerges from the calibration tube 14.
  • the further cooling means and pulling means may be such means as are traditionally employed in manufacturing tubes, and the same applies to the means feeding the inner tube 17.
  • the foam nozzle body 13 also serves as a guiding member for the inner tube 17.
  • the nozzle body 13 is insulated from the tube nozzle 11 and it may be water-cooled if necessary.
  • a plurality of foam nozzles may be disposed in order to produce uniform foam, and pressure sensors for controlling the dosage.
  • the foam nozzles have been so installed that the foam fills the entire space between the surface layer 16 and the inner tube 17 immediately after the surface layer nozzle.
  • the gap between the inner tube 17 and the nozzle body 13 is sealed by conventional technique.
  • an air venting valve may also be mounted on the nozzle body 13, this valve being operated at the initial phase.
  • the design of the nozzle body 13 may also be of the kind that it is extended in the machine direction, and in that manner it would pre-cool the inner surface of the protective skin 16.
  • the calibration tube 14 is located adjacent to the nozzle 11, as is required by the pressure calibration technique.
  • the tube 11 nozzle may be provided with conventional centering and with a helical distributor or equivalent designs known in the art.
  • the plastic mix may be fed into the nozzle 11 by one or several extruders. Towards producing the surface skin 16, also co-extrusion procedures may be applied.
  • the cross-section of the slit of the nozzle 11 and of the calibration tube 14 need not be circular: an oval or other shape may be more advantageous when two or more tubes are being insulated.
  • district heating elements can be manufactured in one work step.
  • new type of pressure calibrating also large dimensions can be manufactured.
  • the thickness profile of the protective skin 16 can be closely controlled, and the outer surface of the protective skin 16 is smooth and conforms exactly to dimension.
  • the location of the foam nozzles in conjunction with the surface layer nozzle ensures that no voids are left in the foam.
  • the procedure also ensures good adhesion between the foam and the inner tube 17, and between the foam and the surface layer.

Abstract

Procedure for manufacturing a tube of insulating material comprising one or several inner tubes (17), a foamed plastic insulation (18) and a plastic surface layer (16). In the procedure, foaming material is conducted to encircle the inner tube (17), and similarly plastic raw material to form the surface layer (16), and around the inner tube (17) are formed the foamed plastic insulation (18) and the surface layer (16) simultaneously in one work step. The surface layer (16) is cooled to desired dimension in a calibration means (14) in which a calibration pressure is produced by the foaming process, the release of this pressure being prevented by the plug which the foam forms as it solidifies. Control of the calibration pressure is effected by regulating the foam raw material supply and the temperature of the raw material.

Description

Procedure for manufacturing a thermally insulating sheath or duct for a pipe or pipes
The present invention concerns a procedure for manufacturing a tube of insulating material comprising one or several inner tubes, foamed plastic insulation and a surface layer of plastic, in said procedure foaming substance being conducted to encircle the inner tube, and similarly plastic raw material for forming a surface layer, and around the inner tube are produced a foamed plastic insulation and a surface layer simultaneously in one step, and in said procedure the surface layer being cooled to desired dimension in a calibration means, the surface being urged against the inner surface of this means by the aid of a calibration pressure.
Currently, district heating elements are manufactured by two different procedures. In one of them, the so-called inside foaming procedure, a thin-walled PEH tube is first manufactured. Within this tube a steel tube is fixed with the aid of supporting props. The intervening space between the PEH and the steel tube is then filled with urethane foam.
In other procedure, the so-called coating procedure, a steel tube Is placed in a mould, wherein urethane foaming is accomplished.
In a separate work step, the foam is coated with polyethylene. By this procedure, also insulation ducts have been manufactured, the foaming being applied around a glass fibre-reinforced polyester tube. The foam is coated as above. Hereby, steel pipes or tubes of various size can be inserted in the polyester tube.
These procedures have the feature in common that they consist of a great number of separate work steps with intermediate storing. They are exceedingly labour-intensive, and they are difficult to automate. In both procedures, supports have to be provided for the inner tube, and these may increase the thermal conductivity. In addition, both procedures involve the handling of urethane foam in an unshielded space.
A means is also known in the art by which a plastic-coated tube of insulating material can be manufactured in a continuous extrusion process. In addition to the surface layer, the inner tube may also be manufactured by extrusion, and the plastic foam is sprayed in between the inner and surface layers in connection with the extrusion process.
In the Finnish patent No. 54878 is described a means by which the inner tube can be coated with a foam layer and a plastic surface layer in one step by the aid of an extrusion press. The foaming nozzle of the means is disposed to follow after the surface layer nozzle in such way that the plastic foam insulation can be injected into the space defined by the surface layer and the inner tube, between the nozzle head and the calibration means. The calibration means, primarily a vacuum calibration means, has been disposed at a distance from the surface layer nozzle, so that the surface layer might cool down to a suitable calibration temperature.
The drawbacks of the means of the Finnish patent No. 54878 include the site of the foaming nozzle as late as after the surface layer nozzle in the direction of travel of the tube, whereby an empty space is formed behind the foaming nozzle. If the air in the empty space is entrained with the foam, a vacuum is produced within the surface layer immediately after the nozzle. This will cause the soft surface layer to be drawn against the foaming nozzle, and the production comes to a stop. The empty space may also be filled with hardened foam, which has a detrimental effect on the quality of the surface layer.
Another drawback of the means of the Finnish patent No. 54878 is the location of the calibrating means at a distance from the surface layer nozzle. This implies the use of vacuum calibration, as has also been pointed out in said patent. However, the manufacturing of larger tube dimensions (over 100 mm) with vacuum calibration is awkward, due to the difficult task of producing a tightly sealing contact between the tube and the calibration tube.
The object of the invention is to achieve an improvement in the procedures known in the art. A more detailed object of the invention is to teach a procedure in which the foaming and the manufacturing of the outer tube can be accomplished simultaneously in one step, around the inner tube, and in which no vacuum calibration is required. It is also an object of the present invention to provide a procedure which is equally suitable for a tube made of steel as for one of plastic.
The objects of the invention are gained by a procedure which is mainly characterized in that the calibration pressure is generated by the aid of the foaming, release of the calibration pressure being prevented by the plug which the foam form as it solidifies.
The other characteristic features of the procedure of the invention are presented in claim 2.
By the procedure of the invention, numerous remarkable advantages are gained. The invention makes possible for instance a procedure for manufacturing district heating elements by which the foaming and the manufacturing of the outer skin can be accomplished simultaenously in one step, around a steel or polyester tube. In the procedure of the invention also no vacuum calibration is needed, as was the case e.g. in the means of the Finnish patent No. 54878. The procedure of the invention is equally well suited for inner tubes of steel and of plastic.
For foaming material in the procedure of the invention any such foams can be used which have characteristics, such as heat tolerance and insulating capacity, appropriate to the purpose. A suitable foaming material is for instance polyurethane.
The invention is described in detail referring to an advantageous embodiment of the invention, presented in the figure of the drawing attached, but to which the invention is not meant to be exclusively confined.
The figure of the drawing presents an advantageous embodiment of the means employed in the procedure of the invention, longitudinally sectioned.
In the figure of the drawing, the means employed in the procedure of the invention has been indicated in general with the reference numeral 10. In the present embodiment, in the means 10 comprises a plastic tube nozzle 11 provided with a hollow mandrel, a guiding support 12 for the inner tube 17, provided with centering facility, a combined inner tube guiding and foam nozzle body 13, an external water-cooled calibration tube 14, tubes 15 supplying the foam materials, and supply ducts 19 for the plastic raw material of the surface layer. The plastic surface layer of the insulating tube manufactured by the procedure of the invention is indicated by reference numeral 16 and the-foam plastic insulation, by reference numeral 18.
In the procedure of the invention, a foam plastic insulation 18 and a surface layer 16 are formed around the inner tube 17 simultaneously in one work step. With the foaming a calibration pressure is produced which can be controlled by regulating the raw material supply and the temperature of the foam raw materials. Outside cooling 14 is applied to cool the surface layer 16 at correct dimension. As it solidifies, the foam forms a plug which prevents the calibration pressure from being released. The running speed, the foam constituents and the length of the calibration tube 14 have to be selected so that the foam has become solid by the time the element emerges from the calibration tube 14. The further cooling means and pulling means may be such means as are traditionally employed in manufacturing tubes, and the same applies to the means feeding the inner tube 17.
The foam nozzle body 13 also serves as a guiding member for the inner tube 17. The nozzle body 13 is insulated from the tube nozzle 11 and it may be water-cooled if necessary. In the nozzle body 13, a plurality of foam nozzles may be disposed in order to produce uniform foam, and pressure sensors for controlling the dosage. The foam nozzles have been so installed that the foam fills the entire space between the surface layer 16 and the inner tube 17 immediately after the surface layer nozzle. The gap between the inner tube 17 and the nozzle body 13 is sealed by conventional technique. If needed, an air venting valve may also be mounted on the nozzle body 13, this valve being operated at the initial phase. The design of the nozzle body 13 may also be of the kind that it is extended in the machine direction, and in that manner it would pre-cool the inner surface of the protective skin 16. The calibration tube 14 is located adjacent to the nozzle 11, as is required by the pressure calibration technique.
The tube 11 nozzle may be provided with conventional centering and with a helical distributor or equivalent designs known in the art. The plastic mix may be fed into the nozzle 11 by one or several extruders. Towards producing the surface skin 16, also co-extrusion procedures may be applied.
The cross-section of the slit of the nozzle 11 and of the calibration tube 14 need not be circular: an oval or other shape may be more advantageous when two or more tubes are being insulated.
By the present procedure district heating elements can be manufactured in one work step. By the new type of pressure calibrating, also large dimensions can be manufactured. The thickness profile of the protective skin 16 can be closely controlled, and the outer surface of the protective skin 16 is smooth and conforms exactly to dimension. The location of the foam nozzles in conjunction with the surface layer nozzle ensures that no voids are left in the foam. The procedure also ensures good adhesion between the foam and the inner tube 17, and between the foam and the surface layer.

Claims

Claims
1. A procedure for manufacturing a tube of insulating material comprising one or several inner tubes (17), a plastic foam insulation (18) and a plastic surface layer (16), in said procedure foaming material being conducted to encircle the inner tube (17) for producing a foamed plastic insulation (18), and similarly plastic raw material for producing a surface layer (16), and around the inner tube (17) being produced the foamed plastic insulation (18) and the surface layer (16) simultaneously in one work step, and in said procedure the surface layer (16) being cooled to desired dimension in a calibration means (14), against the inner surface of which the surface layer (16) is urged by the aid of a calibration pressure, characterized in that the calibration pressure is produced by the aid of the foaming, the release of the calibration pressure being prevented by the plug formed by the foam as it solidifies.
2. A procedure according to claim 1, characterized in that control of the calibration pressure is effected by regulating the foam raw material supply and the temperature of the raw material.
PCT/FI1984/000013 1983-02-14 1984-02-03 Procedure for manufacturing a thermally insulating sheath or duct for a pipe or pipes WO1984003066A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08425636A GB2146286A (en) 1983-02-14 1984-02-03 Procedure for manufacturing a thermally insulating sheath or duct for a pipe or pipes
DK482484A DK482484A (en) 1983-02-14 1984-10-09 PROCEDURE FOR MANUFACTURING A HEAT INSULATOR SHOULDER OR CHANNEL FOR A OR MORE Pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI830487A FI830487L (en) 1983-02-14 1983-02-14 FOERFARANDE FOER TILLVERKNING AV EN VAERMEISOLERANDE MANTEL ELLER KANAL FOER ETT ELLER FLERA ROER.

Publications (1)

Publication Number Publication Date
WO1984003066A1 true WO1984003066A1 (en) 1984-08-16

Family

ID=8516751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1984/000013 WO1984003066A1 (en) 1983-02-14 1984-02-03 Procedure for manufacturing a thermally insulating sheath or duct for a pipe or pipes

Country Status (10)

Country Link
BE (1) BE898894A (en)
DE (1) DE3490043T1 (en)
DK (1) DK482484A (en)
FI (1) FI830487L (en)
FR (1) FR2540782B1 (en)
GB (1) GB2146286A (en)
NL (1) NL8420024A (en)
NO (1) NO843995L (en)
SE (1) SE441732B (en)
WO (1) WO1984003066A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556665A1 (en) * 1992-02-18 1993-08-25 FRIEDRICH THEYSOHN GmbH Process of manufacturing plastic tubes
DE102007045900A1 (en) * 2007-09-26 2009-04-09 Rehau Ag + Co Composite body and method for its production
EP2539128A2 (en) * 2010-02-26 2013-01-02 Isoplus Fernwärmetechnik Gesellschaft m.b.H. Method for producing a composite pipe
EP2586602A1 (en) * 2010-06-28 2013-05-01 Obschestvo S Ogranichennoy Otvetstvennostiyu "Smit-Yartsevo" Method for manufacturing a thermally insulated flexible tube
EP2620268A1 (en) * 2010-09-20 2013-07-31 Obschestvo S Ogranichennoy Otvetstvennostiyu "Smit-Yartsevo" Line for manufacturing a heat-insulated flexible pipe
US10160009B2 (en) 2015-06-29 2018-12-25 Brugg Rohrsysteme Gmbh Method and apparatus for coating a pipe
CN109402545A (en) * 2017-08-18 2019-03-01 东莞中集专用车有限公司 Towing pin protective device

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DE202009007391U1 (en) 2009-05-23 2009-08-13 Kraussmaffei Technologies Gmbh Device for applying a plastic material to the surface of a tubular body

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GB1211860A (en) * 1967-10-03 1970-11-11 Ici Ltd A process for the production of pipe
US3733382A (en) * 1969-04-10 1973-05-15 Shell Oil Co Method of centrifugally applying foam insulation to a pipe
SE401336B (en) * 1972-02-18 1978-05-02 K G Johnson PROCEDURE AND APPARATUS FOR THE PRODUCTION OF CELL PLASTIC PROFILES OF THERMOPLASTIC RESIN HARD MATERIAL
FI54878B (en) * 1973-01-25 1978-12-29 Rakennusmuovi Oy ANORDING FOR FOUNDATION FROM ISOLERROER
SE406734B (en) * 1974-03-09 1979-02-26 Sekisui Plastics PROCEDURE FOR THE MAKING OF FOAMED FORMALS OF THERMOPLASTIC WITH A HARD WEAR-RESISTANT SURFACE, WHICH IS SLIPPERY AND EVEN AND LIKES NATURAL WOOD, AND AN EXTENSION NOZZLE FOR THIS PROCEDURE
DE2758632A1 (en) * 1977-12-29 1979-07-05 Sekisui Plastics Foamed resin moulding prodn. - by extruding and foaming resin into a number of strands, melting the strands together and feeding into a confined take=up zone

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0556665A1 (en) * 1992-02-18 1993-08-25 FRIEDRICH THEYSOHN GmbH Process of manufacturing plastic tubes
DE102007045900A1 (en) * 2007-09-26 2009-04-09 Rehau Ag + Co Composite body and method for its production
EP2539128A2 (en) * 2010-02-26 2013-01-02 Isoplus Fernwärmetechnik Gesellschaft m.b.H. Method for producing a composite pipe
EP2586602A1 (en) * 2010-06-28 2013-05-01 Obschestvo S Ogranichennoy Otvetstvennostiyu "Smit-Yartsevo" Method for manufacturing a thermally insulated flexible tube
EP2586602A4 (en) * 2010-06-28 2015-04-15 Obschestvo S Ogranichennoy Otvetstvennostiyu Smit Yartsevo Method for manufacturing a thermally insulated flexible tube
EP2620268A1 (en) * 2010-09-20 2013-07-31 Obschestvo S Ogranichennoy Otvetstvennostiyu "Smit-Yartsevo" Line for manufacturing a heat-insulated flexible pipe
EP2620268A4 (en) * 2010-09-20 2014-10-15 Obschestvo S Ogranichennoy Otvetstvennostiyu Smit Yartsevo Line for manufacturing a heat-insulated flexible pipe
US10160009B2 (en) 2015-06-29 2018-12-25 Brugg Rohrsysteme Gmbh Method and apparatus for coating a pipe
CN109402545A (en) * 2017-08-18 2019-03-01 东莞中集专用车有限公司 Towing pin protective device
CN109402545B (en) * 2017-08-18 2024-04-12 东莞中集专用车有限公司 Traction pin protection device

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DK482484D0 (en) 1984-10-09
FI830487L (en) 1984-08-15
FI830487A0 (en) 1983-02-14
SE441732B (en) 1985-11-04
DK482484A (en) 1984-10-09
NO843995L (en) 1984-10-04
FR2540782B1 (en) 1988-07-22
SE8405008D0 (en) 1984-10-08
SE8405008L (en) 1984-10-08
NL8420024A (en) 1984-12-03
FR2540782A1 (en) 1984-08-17
DE3490043T1 (en) 1985-02-07
BE898894A (en) 1984-05-30
GB8425636D0 (en) 1984-11-14
GB2146286A (en) 1985-04-17

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