WO1994025789A1 - Ameliorations concernant la fabrication de structures tubulaires - Google Patents

Ameliorations concernant la fabrication de structures tubulaires Download PDF

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Publication number
WO1994025789A1
WO1994025789A1 PCT/GB1994/000494 GB9400494W WO9425789A1 WO 1994025789 A1 WO1994025789 A1 WO 1994025789A1 GB 9400494 W GB9400494 W GB 9400494W WO 9425789 A1 WO9425789 A1 WO 9425789A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
filamentary material
mandrel
inner layer
tubular
Prior art date
Application number
PCT/GB1994/000494
Other languages
English (en)
Inventor
Mick Askin
Original Assignee
Ina Acquisition Corp.
Insituform (Netherlands) Bv
Insituform Licensees Bv/Sa
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 Ina Acquisition Corp., Insituform (Netherlands) Bv, Insituform Licensees Bv/Sa filed Critical Ina Acquisition Corp.
Priority to AU62130/94A priority Critical patent/AU6213094A/en
Publication of WO1994025789A1 publication Critical patent/WO1994025789A1/fr
Priority to DK145794A priority patent/DK145794A/da

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
    • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/382—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges using laminated sheets
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/82—Cores or mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/005—Hoses, i.e. flexible
    • B29L2023/006—Flexible liners

Definitions

  • This invention relates to the manufacture of tubular structures which in one particularly advantageous form, are suitable for the lining of underground pipelines and passageways.
  • Such tubular structures will be referred to hereinafter as lining pipes, but the invention as will be appreciated from the following has wider application.
  • the tubular structures to which the invention relates typically will be of a flexible character but will be constructed so as to have circumferential strength so as to be provided with a hoop stress capability so that the structure can be used in some instances as pipes in their own right, as opposed to lining pipes, in which latter case the pipes are applied against existing structures such as underground pipelines and passageways.
  • the tubular structures to which the invention relates are furthermore of a type including one or more layers of a material which can absorb curable synthetic resin such as a polyester or epoxy resin.
  • the tubular structure can be changed from the flexible and shapable condition into a rigid form by impregnating the said layer or layers with the curable synthetic resin followed by the curing of the resin with the tubular structure held in the configuration which it is to retain when the resin is rigid.
  • the tubular structures may, when in the dry state i.e. without any resin impregnating said layer or layers, or when in the impregnated but uncured state, be folded to a flat condition and wound or stacked for storage or transportation, but in subsequent use, the structures are inflated whilst impregnated with resin, so as to take a circular or other cross section, and the resin is then cured in order to form a rigid tubular strcuture.
  • tubular structures to which the invention relates is well known in the lining of underground pipelines and passageways.
  • the very early inventions in this field date from the late 1960's and early 70's, and reference is made to two specific U.S. Patents Nos. 4,009,063 and 4,064,211 for a detailed disclosure of typical tubular structures to which the invention relates. Since these early inventions, many modifications have been made as to the materials to be used for the tubular structures, the design of the tubular structures, and the resins to be used for impregnating the tubular structures.
  • a resin curable by ultraviolet light can be adopted for these tubular structures, the structures being pre-impregnated with the resin and only caused to cure when exposed to ultraviolet light which may be applied from a source which is drawn through the tubular structure after it has been inflated and placed in a pipeline or passageway.
  • curable synthetic resins have been made to provide that the catalyst or initiator or the resin is contained in microcapsules, and the microcapsules are ruptured at the appropriate time in order to release the initiator or catalyst to cause the resin to harden.
  • Other resins have been designed to have a long shelf life in the uncured state, but be capable of rapid curing when desired. All of these resins are usable in connection with the present invention.
  • a resin absorbent felt material specifically a polyester felt which is of needled construction.
  • This material has been used largely according to the method set forth in said U.S. Patent No 4,064,211 for producing pipe linings, and depending upon the required thickness of the pipe lining, so one or more layers of said felt material is used.
  • the layer, or the outermost layer has applied to its outermost surface a coating or membrane of a relatively impermeable material such as polyurethane which bonds to the felt, and also forms a shell for retaining the resin which impregnates the felt.
  • the outer coating or membrane performs yet a further function of acting as a barrier between the everting fluid medium (air or water or both) and the impregnated felt layer or layers so that the pipe lining can be everted into and along the pipeline or passageway and directly onto the pipeline or passageway surface.
  • the present invention is concerned with tubular structures and methods of their manufacture whereby the structures will be usable in the said method of pipelining as described in said U.S. Patent No. 4,064,211, although as explained hereinbefore the invention has wider application.
  • tubular structures to provide lining pipes which have increased structural strength so as to withstand increased internal pressures, such as exist in gas pipes. Increased strength also enables the lining pipes to withstand increased external pressures for example from ground water, when the pipe is located underground under the water table.
  • An object of the present invention is to provide tubular structures with improved hoop stress so that the resulting structures when impregnated with synthetic resin which is cured, will have enhanced hoop strength to make the tubular structures more capable of holding internal pressure and withstanding external pressure before fracturing or buckling.
  • tubular structures are reinforced circumferentially in a most effective and economic manner by a novel method of manufacture.
  • a tubular structure comprises an inner resin absorbent layer, and at least one outer resin absorbent layer provided with a realtively impermeable coating or membrane, and between said inner and outer layers is reinforcement in the form of helically wound filamentary material.
  • the helically wound filamentary material is positioned at an angle to provide maximum increase in hoop strength in the resulting tubular structure and maximum improvement in tensile strength consistant with a minimum utilisation of the filamentary material.
  • the filamentary material is preferably laid in oppositely handed helical windings, and there may be two or more layers of helically wound filamentary material.
  • Each layer of helically wound filamentary material may be made up of single or multiple filament strands of a suitable reinforcing material such as nylon or like strength synthetic plastics material and/or glass fibres.
  • the inner and outer layers of absorbent material preferably are of fibrous felt and typically will be of polyester or similar felt.
  • the outer coating may typically be of polyurethane or the like.
  • the filamentary reinforcement may be between the inner section and middle section and/or between the middle section and outer section on the other hand.
  • Any or each section may be made up of one or more layers.
  • each of the inner, middle and outer absorbent layers may typically be a 6mm thick felt.
  • the coating thickness is measured in microns.
  • the inner layer in such case may either be preformed or formed into tubular configuration by being wrapped so that the free edges butt and the butted edges are sewn together to form a seam.
  • the inner layer thus formed into tubular configuration is then fed over a mandrel so as to retain a circular form whilst the filamentary material or a first layer of filamentary material is applied typically by winding a supply of the filamentary material around the mandrel and inner tubular layer whilst the tubular layer moves axially over the mandrel.
  • the middle layer of felt may be applied and a second layer of filamentary material may be applied by a similarly rotating supply of the material around the mandrel but in the opposite direction from the first supply so that the helically wound materials of the respective layers are of opposite hand.
  • the helix angle of the filamentary material in relation to the inner tubular layer on which it is wound can be varied by varying the speed of rotation of the supply of filamentary material, and the speed of feed of the inner tube.
  • the inner tube preferably is used in connection with a magnetically suspended mandrel so that there are no mechanical connections between the mandrel and any surrounding support so that the feeding of the inner tube over the mandrel is simplified.
  • the outer layer of absorbent material may be applied around the assembly with the filamentary material thereon, and the free edges of the outer layer may be butted and sealed by means of a strong reinforcement tape.
  • the filamentary material As the filamentary material is being applied, it or the inner and/or middle layer may be sprayed with a suitable adhesive whereby it will bond to the inner/middle tubular layer at the correct helix angle and will remain so bonded in subsequent use of the resulting tubular structure.
  • the mandrel may be disposed horizontally or vertically as required, and vertical disposition is most suitable when the inner layer is preformed.
  • the resulting tubular structure is particularly suitable for forming a lining pipe in a process as described in said U.S. Patent No. 4,064,211, and the resulting structure in such case would be used by being impregnated with the synthetic resin, the resin being introduced to the interior of the resulting tubular structure so as to impregnate the inner and outer absorbent layers and so that the filamentary reinforcement becomes embedded in the resin.
  • the tubular structure may be appropriate or desirable to work the tubular structure for example through nip rollers in order to spread the resin effectively throughout the absorbent layers.
  • the interior of the tubular structure may have a vacuum applied thereto in order to remove any air therein again to enhance the thoroughness of the impregnation.
  • tubular structure When the tubular structure has been so impregnated, it is then ready for use in the manner described in siad U.S. Patent.
  • the tubular structure can in fact be applied by the method and means as described in U.S. Patent 4,778,553 or European Patent Application No. 91902304.4 or European Patent Application No. 90905593.1 incorporated herein by reference.
  • production of the tubular structure comprises the use of a roll 10 of needled felt material, typically polyester felt of a thickness in the order of 6mm.
  • the roll of felt 10 is supported by means not shown so that the felt can be unwound from the roll as indicated by reference 12 and guided round guide rollers 14 and 16 which are rotatable about their horizontal axes.
  • the felt is led from the guide rollers 16 to a ploughing or shaping device 18 which starts to shape the felt into tubular configuration so that by the time the felt reaches a sewing machine head 20 it is in tubular configuration with the free edges of the web in butting contact.
  • the sewing machine head 20 arranges, as described in U.S. Patent 4,446,181, for the sewing together of the butting edges to complete the tubular form of the felt 12, which felt forms the inner layer of the resulting tubular structure as will be clear from the following.
  • the felt is of course designed to absorb synthetic resinous material for the reasons explained above.
  • the thus formed inner tube of the final structure is fed over a magnetically suspended round mandrel 22 and in fact is drawn over the mandrel by means of a pull-through device 24 which may typically comprise a pair of rollers defining a nip through which the tubular structure is drawn, the rollers being driven by a suitable motor 25.
  • a pull-through device 24 which may typically comprise a pair of rollers defining a nip through which the tubular structure is drawn, the rollers being driven by a suitable motor 25.
  • each of the heads 28 and 30 as shown comprises a cup-shaped casing having a drive boss 32, 34 by which the casing may be rotated around the axis of the mandrel 22.
  • the axis of each of the cup-shaped casings is coincident with the mandrel axis.
  • each head Inside the cup-shaped casing of each head are two supplies or bobbins 36, 38 in the case of cup 28 and 40 and 42 in the case of cup 30.
  • bobbins carry filamentary materials in the form of glass rovings, and the rovings, as indicated by references 44 and 46 in the case of winding cup 28, and 48 and 50 in the case of winding cup 30 are helically wound onto the inner tube 26 as it progresses as indicated by arrow 52 along the mandrel 22.
  • the rovings are unwound as shown, and are helically wound on the inner tube, and whilst they are being wound, a special adhesive is sprayed onto each layer of reinforcement on the inner tube 22 by a spraying device (not shown), so that the reinforcement rovings will be held in position during subsequent handling of the resulting tubular structure.
  • the winding cups 28 and 30 are rotated in opposite directions so that the rovings 44 and 46 will be wound on the inner tube 26 helically with the helix angle of one hand, whilst the rovings 48 and 50 will be wound on the inner tube with the rovings helically wound in the opposite hand.
  • the inner tube 22 will travel smoothly over the mandrel 22 in that the mandrel is suspended so as to float by a pair of magnets 54 and 56 which ensures that there is no mechanical obstruction on the mandrel to impede the progress of the inner tube over same.
  • the emerging inner tube with the glass rovings reinforcement would thereon is overwrapped whilst on the mandrel by a second web material 58 from a roll 60 of same.
  • the second web of material 58 is a coated felt material as referred to herein, and as shown in the ringed detail comprises the felt 57 and has on its outer surface 62 a coating or layer (59) of relatively impermeable material such as a polyurethane film or membrane which is bonded to a layer of felt similar to felt 12.
  • the felt side is applied over the rovings 44 to 50, and a suitable plough device wraps the web 58 around the inner tube and rovings so that the free edges of the outer layer as the web 58 is wrapped, are butted together and then are sealed by means of a sealing tape 64 supplied from a reel of same 66, thereby producing the resulting tubular structure which is pulled from the machine by means of the pull-through device 24.
  • the finished tubular structure which has a degree of stiffness but still is flexible is folded and stacked in a stack pile 68 as shown.
  • the finished tubular structure 68 subsequently will be used as hereinbefore described by being impregnated with resin, and then applied to a pipeline or passageway, when a pipe lining is to be formed, or can be used for the creation of a new pipe.
  • the tubular structure 68 will have enhanced hoop strength and tensile strength properties by virtue of the application of the glass rovings.
  • any suitable filamentary material can be used which will provide the required strength characteristics.
  • the effective production of the tubular structure is achieved by the use of the smooth magnetically supported mandrel 22, which is of appropriate diameter to smooth out the inner tube 26 as it is pulled over the mandrel.
  • winding cups or machines 28 and 30 as are required can be provided to give the desired reinforcement to the tubular structure, and intermediate layers of felt may be applied between the cups for example to ensure that the filamentary reinforcement is located close to the inner surface and/or outer surface of the tubular structure which is the most effective location of the reinforcement.
  • the tape 64 preferably is of a reinforced type in order to withstand the inflation pressures which will subsequently be applied to the tubular structure in its utilisation.
  • the helix angle of each roving or reinforcement can be controlled by varying the rotational speed of the winding machine, and/or by varying the linear speed of the feed of the tubular structure through the machine as indicated by arrow 52.
  • This variation capability enables the provision of optimisation of the use of the reinforcement in providing the correct relationship between hoop strength, longitudinal strength, and the angle of the reinforcement to minimise creasing at bends in an underground pipeline or passageway in which the tubular structure is eventually installed. This optimisation results in lowest material cost by using reinforcement in its most efficient form.
  • the reinforcement When the tubular structure is eventually impregnated with curable resin as described herein, the reinforcement will be fully encapsulated within the impregnating resin, and any appropriate technique for impregnation of the tubular structure and installation of same may be adopted such as that for example described in European Patent Application No. 90905593.1.
  • the inner layer 26 may be preformed into tubular configuration, so that the sewing machine would not be required. This can save down time of the machine which may. arise due to running difficulties with the sewing machine, which are not unusual.
  • the machine can be arranged with the mandrel vertical if required; this is a particularly suitable arrangement when the inner layer is pre-formed as decribed above.
  • a reaction means such as a roller
  • the other side of the mandrel to support the pressure which will be applied to the mandrel by the sealing roller which seals the tape 64 to the outer layer film 62.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une structure tubulaire flexible renforcée (68) pouvant être imprégnée avec une résine qu'on fabrique en appliquant une couche interne (12) sous une forme tubulaire sur un mandrin flottant (62) qui est suspendu magnétiquement de manière à ce que la couche (12) puisse être amenée sur une extrémité du mandrin (62) et évacuée depuis son autre extrémité. A mesure que la couche interne (12) arrive, on enroule en hélice autour de la couche interne (12) des filaments de renforcement (44-50) sur lesquels on a pulvérisé un adhésif. Une couche absorbante externe de résine (58) est alors appliquée et cette couche a un revêtement externe imperméable (59) de sorte que les couches interne et externe (12, 58) des structures résultantes (68) peuvent être imprégnées de résine, dans laquelle on immerge les filaments de renforcement (44-50), en appliquant la résine sur l'intérieur de la structure (68).
PCT/GB1994/000494 1993-05-01 1994-03-14 Ameliorations concernant la fabrication de structures tubulaires WO1994025789A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU62130/94A AU6213094A (en) 1993-05-01 1994-03-14 Improvements relating to the manufacture of tubular structures
DK145794A DK145794A (da) 1993-05-01 1994-12-21 Forbedret fremstilling af rørformede strukturer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939309087A GB9309087D0 (en) 1993-05-01 1993-05-01 Improvements relating to the manufacture of tubular structures
GB9309087.6 1993-05-01

Publications (1)

Publication Number Publication Date
WO1994025789A1 true WO1994025789A1 (fr) 1994-11-10

Family

ID=10734844

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000494 WO1994025789A1 (fr) 1993-05-01 1994-03-14 Ameliorations concernant la fabrication de structures tubulaires

Country Status (4)

Country Link
AU (1) AU6213094A (fr)
DK (1) DK145794A (fr)
GB (1) GB9309087D0 (fr)
WO (1) WO1994025789A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0876898A2 (fr) * 1997-05-06 1998-11-11 BKP Berolina Polyester GmbH & Co. KG Dispositif pour fabriquer une gaine tubulaire
WO2005051634A1 (fr) * 2003-11-27 2005-06-09 Aisapack Holding S.A. Dispositif pour la fabrication de tubes en continu

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5356075A (en) * 1990-07-10 1994-10-18 Apv Pasilac Anhydro As Atomizer wheel with a divided wear ring

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491152A (en) * 1947-10-03 1949-12-13 Ben Kravitz Hose forming machine
US3132416A (en) * 1961-03-14 1964-05-12 Fmc Corp Method of and apparatus for manufacturing and installing continuous conduit
US3855031A (en) * 1972-02-16 1974-12-17 Mackenhus Corp Method and apparatus for laminating, impregnating and curing continuous tubes
DE2413577A1 (de) * 1974-03-21 1975-10-02 Komos Ing Ernst August Mueller Vorrichtung zur verarbeitung schlauchfoermigen materials zu saecken
DE2638915A1 (de) * 1976-08-28 1978-03-02 Oltmanns Ziegelwerk Vorrichtung zum fortlaufenden umhuellen eines kunststoff-draenrohres mit einem filtermantel
FR2383011A1 (fr) * 1977-03-08 1978-10-06 Windmoeller & Hoelscher Procede pour renforcer des feuilles en gaine mises a plat a l'aide d'une couche de bandelettes
DE3614963A1 (de) * 1986-03-29 1987-10-01 Roeders Ag Geb Verfahren zum herstellen eines sanierungsschlauches fuer rohrleitungen sowie ein durch dieses verfahren hergestellter sanierungsschlauch
EP0278466A1 (fr) * 1987-02-11 1988-08-17 Insituform International Inc. Matériau pour le revêtement de canalisations
WO1991014896A1 (fr) * 1990-03-19 1991-10-03 Insituform Group Limited Materiaux de garnissage de pipelines et de passages

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491152A (en) * 1947-10-03 1949-12-13 Ben Kravitz Hose forming machine
US3132416A (en) * 1961-03-14 1964-05-12 Fmc Corp Method of and apparatus for manufacturing and installing continuous conduit
US3855031A (en) * 1972-02-16 1974-12-17 Mackenhus Corp Method and apparatus for laminating, impregnating and curing continuous tubes
DE2413577A1 (de) * 1974-03-21 1975-10-02 Komos Ing Ernst August Mueller Vorrichtung zur verarbeitung schlauchfoermigen materials zu saecken
DE2638915A1 (de) * 1976-08-28 1978-03-02 Oltmanns Ziegelwerk Vorrichtung zum fortlaufenden umhuellen eines kunststoff-draenrohres mit einem filtermantel
FR2383011A1 (fr) * 1977-03-08 1978-10-06 Windmoeller & Hoelscher Procede pour renforcer des feuilles en gaine mises a plat a l'aide d'une couche de bandelettes
DE3614963A1 (de) * 1986-03-29 1987-10-01 Roeders Ag Geb Verfahren zum herstellen eines sanierungsschlauches fuer rohrleitungen sowie ein durch dieses verfahren hergestellter sanierungsschlauch
EP0278466A1 (fr) * 1987-02-11 1988-08-17 Insituform International Inc. Matériau pour le revêtement de canalisations
WO1991014896A1 (fr) * 1990-03-19 1991-10-03 Insituform Group Limited Materiaux de garnissage de pipelines et de passages

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0876898A2 (fr) * 1997-05-06 1998-11-11 BKP Berolina Polyester GmbH & Co. KG Dispositif pour fabriquer une gaine tubulaire
EP0876898A3 (fr) * 1997-05-06 1999-03-17 BKP Berolina Polyester GmbH & Co. KG Dispositif pour fabriquer une gaine tubulaire
WO2005051634A1 (fr) * 2003-11-27 2005-06-09 Aisapack Holding S.A. Dispositif pour la fabrication de tubes en continu

Also Published As

Publication number Publication date
DK145794A (da) 1994-12-21
AU6213094A (en) 1994-11-21
GB9309087D0 (en) 1993-06-16

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