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WO2004037517A1 - Procede de precontrainte de raccords de tuyaux en polymere semicristallin - Google Patents

Procede de precontrainte de raccords de tuyaux en polymere semicristallin Download PDF

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Publication number
WO2004037517A1
WO2004037517A1 PCT/AU2003/001414 AU0301414W WO2004037517A1 WO 2004037517 A1 WO2004037517 A1 WO 2004037517A1 AU 0301414 W AU0301414 W AU 0301414W WO 2004037517 A1 WO2004037517 A1 WO 2004037517A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe end
crystalline polymer
stressing
forming tool
semi
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/AU2003/001414
Other languages
English (en)
Inventor
Samuel Costin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AUSTRALIAN ENGINEERING Corp Pty Ltd
Original Assignee
AUSTRALIAN ENGINEERING Corp Pty Ltd
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 AUSTRALIAN ENGINEERING Corp Pty Ltd filed Critical AUSTRALIAN ENGINEERING Corp Pty Ltd
Priority to AU2003273626A priority Critical patent/AU2003273626A1/en
Publication of WO2004037517A1 publication Critical patent/WO2004037517A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/025—Belling or enlarging, e.g. combined with forming a groove combined with the introduction of a sealing ring, e.g. using the sealing element as forming element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • B29B13/024—Hollow bodies, e.g. tubes or profiles
    • B29B13/025—Tube ends
    • 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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/004—Semi-crystalline

Definitions

  • the present invention relates to a method of pre-stressing an expansion formed semi-crystalline polymer pipe end.
  • the present invention also relates to a semi-crystalline pipe end formed using the method, as well as a collapsible forming tool for use in expansion forming of pipe ends.
  • pellets of polymeric material are heated until the polymer becomes molten, softens and plasticises.
  • the pellet is pushed through an injection nozzle.
  • the molten polymer is then forced under pressure into a cavity of a steel mould.
  • the polymer conforms to the shape of the steel mould and hardens as it cools after which time it is ejected.
  • Such steel moulds used for injection moulding are very expensive to manufacture and the maintenance costs are very high. Also, the costs of the labour required for setting a cavity in place is very high.
  • Machining of polymer joiners from solid billet solves some of the problems of injection moulding. Using this process, a billet of solid polymer is placed in a shaping machine such as a lathe. The lathe is programmed to shape the billet by removing material until the desired shape is achieved. Machining overcomes the requirement of mass production, as well as the high set-up costs and large stockholdings associated with, injection moulding. However, the individual handling of each machined joiner, the high machine time and the wastage of the polymer increases the cost of such fittings significantly above the cost of those made using injection moulding.
  • Polymer pipe joiners may also be made using conventional expansion forming tools.
  • Traditional expansion forming involves heating a material to a temperature at which plastic flow can occur and expanding the material about a forming tool .
  • the forming tool is typically of greater cross-sectional diameter than the item being formed such that the heated material is caused to expand during forming.
  • Expansion forming is extremely cost-favourable compared with injection moulding and machining techniques, are simple and may be done in situ or on site, for example when repairs or extensions are required for an existing pipeline.
  • Such techniques have in the past been restricted to the types of polymers with very low shrinkage after heating. Control over the shrinkage is also important for certain applications, as the dimensional tolerances for sealing under pressure can be very tight.
  • Polyvinyl chloride (PVC) pipe end joiners or sockets are able to be formed using this expansion method because PVC is a type of polymer that experiences only a very small change of shape after an expanded section has cooled. Moreover, the very small amount of shrinkage that does occur for PVC pipe end joiners or sockets is consistent for each pipe and therefore predictable.
  • variable shrinkage property of semi-crystalline polymers is understood to be caused because semi-crystalline polymers have both amorphous regions and crystalline regions. It is understood that internal stresses develop as semi-crystalline polymers cool after being heated due to differential shrinkage between the crystalline and amorphous regions. The crystalline regions shrink more and at a different rate to the amorphous regions. This is understood to be at least in part due to the better packing of molecular chains in the crystalline regions. After forming and/or in service, semi-crystalline polymer fittings formed using expansion forming methods are known to continue to shrink as these internal stresses are relieved.
  • the present invention was developed to overcome at least some of the abovementioned problems with a view to using the variable shrinkage properties of semi-crystalline polymers as an advantage.
  • pipe is intended to mean any conduit through which fluid may flow.
  • a fluid would include a gas, a liquid or a liquid slurry containing particulate solids.
  • the pipe may be of any preferred cross- sectional profile or any desired length and formed using any conventional method.
  • a method for pre-stressing an expansion formed semi-crystalline polymer pipe end comprising the steps of: heating an end portion of the pipe end to at least a temperature at which said semi-crystalline polymer exhibits plastic flow but below the melting point temperature of the polymer; expanding said heated end portion to form an expanded portion having a preferred arrangement of as-formed dimensions; allowing said expanded portion to cool; and, inserting at least one shape maintenance means into an area of the expanded portion to maintain the as-formed dimensions of said area of the expanded portion, whereby further shrinkage of said area of the expanded portion, which would otherwise occur to relieve internal stresses generated during the step of allowing the expanded portion to cool is resisted by the shape maintenance means thereby pre-stressing the pipe end.
  • the step of inserting the shape maintenance means occurs simultaneously with the step of expanding the heated end portion. More preferably, the step of inserting the shape maintenance means occurs after the step of cooling the expanded portion.
  • the step of expanding the heated pipe ends further comprises the step of expanding the heated pipe end about a mandrel section of a forming tool, the mandrel section having an exterior profile correspondingly shaped so as to provide the preferred arrangement of as-formed dimensions during expansion forming. It is to be understood that some shrinkage may occur during or after cooling of the expanded portion in areas not provided with a shape maintenance means .
  • the method further comprises the step of collapsing the forming tool so as to facilitate removal of the forming tool from the expanded end portion.
  • the step of inserting the shape maintenance means comprises the step of mounting the shape maintenance means on a forming tool and inserting the shape maintenance means with the forming tool. More preferably, the shape maintenance means is left in position.
  • the step of collapsing the forming tool is conducted after the step of allowing the expanded portion to cool.
  • the shape maintenance means is in the form of an annulus .
  • the semi-crystalline polymer is selected from the group consisting of polyethylene, polypropylene, polystyrene, nylon, acetal, PBT and PET.
  • the semi-crystalline polymer is polyethylene and the step of heating is conducted at a temperature in the range of 105 to 125°C and more preferably in the range of 110 to 120°C.
  • the semi-crystalline polymer is polypropylene and the step of heating is conducted in the range of 140 to 158°C and more preferably in the range of 145 to 155°C.
  • the shape maintenance means is one of a plurality of shape maintenance means inserted in the expanded portion.
  • the method further comprises the step of positioning a sealing means within the expanded portion of the pipe end.
  • the method further comprises the step of locally restricting the diameter of an area along the length of the heated portion so as to generate a shoulder within the expanded portion.
  • the method further comprises the step of positioning the inserted shape maintenance means against the pressure side of the shoulder.
  • the sealing means is positioned adjacent to the shape maintenance means. More preferably, the sealing means is positioned against the pressure side of the shape maintenance means .
  • the step of locally restricting the diameter of an area occurs during the step of expanding the heated section.
  • the step of locally restricting the diameter of an area is conducted during the step of allowing the expanded portion to cool .
  • the step of locally restricting the diameter of an area is conducted during the step of heating.
  • the forming tool comprises a mandrel section and a detachably coupled tail section
  • the mandrel section comprises a plurality of segments, each segment being held in position by a rib fixedly attached to and extending from the tail section
  • the step of collapsing the forming tool comprises the step of removing the tail section from the mandrel section whereby the ribs holding each segment are removed from the plurality of segments allowing each segment to move inwardly to collapse the forming tool.
  • a collapsible forming tool for use in expansion forming a polymer pipe end, the pipe end having a preferred arrangement of as-formed dimensions
  • the collapsible forming tool comprising: a front section for insertion of the forming tool in the pipe end; a mandrel section about which the pipe end is formed, the mandrel section comprising an exterior profile correspondingly shaped so as to provide the preferred arrangement of as-formed dimensions to the pipe end in use, the mandrel section comprising a plurality of segments; an upwardly tapering section between the end section and the mandrel section to expansion of the pipe end about the forming tool in use; and, a tail section detachably coupled with the mandrel section and comprising a plurality of ribs fixedly attached to the tail section and extending therefrom, each segment of the mandrel section being held in position by one or more of the ribs .
  • the exterior profile of the mandrel section comprises a plurality of external diameters .
  • the forming tool further comprises a releasable shape maintenance means 26 which remains in position when the tool is collapsed in use.
  • the forming tool further comprises a seat for releasably positioning a shape maintenance means.
  • the shape maintenance means is in the form of an annulus .
  • an expansion formed semi-crystalline polymer pipe end formed using various aspects of the method as claimed.
  • Expansion may be achieved by way of applying an external force. Tension may be applied to the outside of the pipe with tension maintained until such time as the pipe is cooled. The tension means is removed once the pipe end has cooled and one or more shape maintenance means are positioned in the usual manner.
  • Figure 1 is a cross-sectional side view of a pipe end in pre-expanded condition before insertion of a forming tool, as well as a side view of a forming tool;
  • Figure 2 is a cross-sectional view of the pipe end of Figure 1 after expansion forming, with a shape maintenance means inserted to prevent further shrinkage of the expanded portion in the area adjacent to the shape maintenance means;
  • Figure 3 is a part cross-sectional side elevation of a forming tool, including a shape maintenance means for expansion forming a semi-crystalline polymer pipe end;
  • Figure 4 is a series of isometric illustrations of a collapsible forming tool showing how the segments are held in position by pins until the tail section is removed;
  • Figure 5 is a cross-sectional view of the pipe end of Figure 2 in sealing engagement with a second pipe in use.
  • joiners that are made independently of a pipe, pipes of other cross-sectional shapes, and pipes for which each of the two ends is subjected to expansion forming.
  • the joiner may be intended to serve as a fitting for joining a first pipe end to another pipe end.
  • various embodiments of the present invention may be used to join an end of a pipe to a T-piece or other form of junction or form one end of a flanged end, bend, T- piece or adaptor.
  • FIG. 1 A preferred embodiment of a method of expansion forming a polyethylene polymer pipe end is described with reference to Figures 1 to 5.
  • an elongate cylindrical pipe 10 having an end portion 12 of nominal initial internal diameter A and initial wall thickness T, and a forming tool 14.
  • the end portion 12 of the pipe 10 is heated to a temperature at which plastic flow occurs for the type of semi-crystalline polymer from which the pipe end is made.
  • the upper limit of the temperature to which the end portion 12 is heated is the melting point of that semi- crystalline polymer.
  • the pipe end is constructed from polyethylene and the pipe end is heated to a temperature in the range of 105 to 125°C and preferably between 110 and 120°C.
  • the forming tool 14 has a front section 15 of reduced cross- section to facilitate insertion of the forming tool 14 into the end portion 12, a mandrel section 17, and an upwardly tapering section 19 between the front section 15 and the mandrel section 17.
  • the mandrel section 17 has a nominal outer diameter B which is greater than the nominal initial internal diameter A of the pipe end portion 17.
  • the forming tool is driven into the heated end portion 12 which in the process expands to conform with the shape of the mandrel section 17 of the forming tool 14.
  • the forming tool 14 has an exterior profile shaped so as to provide a plurality of diameters 32, 34, 36 and 38.
  • the as-formed internal diameters 42, 44, 46 and 48 respectively of the expanded portion 16 correspond with the outer diameters 32, 34, 36 and 38 respectively of the of the forming tool 14.
  • the forming tool 14 is removed. Removal occurs preferably once the expanded section has cooled to ambient, but may occur earlier provided that the expanded end portion 16 has cooled sufficiently such that the semi-crystalline polymer no longer exhibits plastic flow.
  • one of the key problems associated with expansion forming of semi-crystalline polymers is the shrinkage that continues to occur to relieve internal stress after forming.
  • one or more shape maintenance means 18, typically in the form of an annulus is/are inserted into the expanded end portion 16.
  • the shape maintenance means 18 may be inserted during forming of the expanded portion 16 or after removal of the forming tool 14 provided that the shape maintenance means is inserted shortly after removal of the forming tool 14 to preserve the as-formed dimensions.
  • the annulus 18 is inserted by the forming tool 14 during expansion of the heated end portion 12.
  • the shape maintenance means retains the as-formed dimensions of the expanded end portion 16 and resists further shrinkage of the semi-crystalline material . As further shrinkage occurs to relieve internal stress, an increasing compressive stress is applied radially inwardly to the shape maintenance means 18. The expanded pipe end is unable to shrink to relieve the internal stress due to the presence of the shape maintenance means 18 resulting in the expanded pipe end becoming effectively pre-stressed.
  • the annuli 18 may be physically joined to the expanded portion 16 if required using conventional joining methods.
  • semi-crystalline polymers continue to attempt to shrink after expansion forming to relieve the internal stresses generated during cooling of these materials.
  • an increasing radially inwardly directed compressive stress is applied to each of the annuli.
  • the expanded section 16 effectively holds the annuli in position with increasing force .
  • the expanded pipe ends would typically be used to facilitate joining of one pipe to another in a high pressure gas pipeline.
  • the forces on the pipe are directed radially outwardly.
  • the radially inwardly directed compressive stress must be overcome before the polymeric material experiences the outwardly directed operating stress.
  • the variable shrinkage phenomenon is being used to reduce the effective operating stress experienced by the expanded position of the pipe end 16.
  • the force retaining the shape maintenance means 18 tends to increase over time as the internal stress of the expanded end portion 16 continues to relax in storage or during service.
  • the semi-crystalline material at the heated pipe end 12 expands from an initial nominal internal diameter A to an expanded internal diameter B.
  • Conservation of volume of the material dictates that during expansion forming, the original wall thicJkness T of the end portion 12 decreases to a final wall thicJkness T' in the expanded end portion 12, wherein T' is less than T.
  • the capacity of a particular pipeline is a function of the operating pressure. For a given operating pressure, a minimum wall thicJkness of any given section of the pipe is a design parameter. A reduction in the wall thicJkness in the expanded end portion 16 from T to T' would ordinarily be considered a site of potential weakness for a pipe intended for use for a high-pressure pipeline.
  • the shape maintenance means 18 may also be used as a means for locating and/or retaining a seal as described in greater detail below with reference to Figure 5.
  • FIG. 3 A preferred embodiment of a collapsible forming tool 14 for use in expansion forming is illustrated in Figures 3 and 4.
  • the forming tool 14 includes a separate tail section 31 from which the mandrel section 17 may be detachably coupled.
  • a shape maintenance means 18 in the form of an annulus may be positioned between the mandrel section 17 and the tail section 31. The shape maintenance means 18 is then inserted with the forming tool 14 into the heated pipe end 12. When the forming tool 14 is collapsed and removed after expansion forming, the shape maintenance means remains in position.
  • the forming tool 14 is provided with ribs 33 fixedly attached to and extending from the tail section 31 into the mandrel section of the forming tool 14.
  • the mandrel section 17 comprises four variously sized segments 50, 52, 54 and 56 arranged to collectively form the outer profile of the mandrel section 17 of the forming tool 14.
  • Each of the segments 50, 52, 54 and 56 is held in position by one or more of the ribs 33, as well as extension piece 35, fixedly attached to and extending from the tail section 31.
  • the ribs 33 are received in correspondingly shaped holes 39 in the segments 50, 52, 54 and 56 to hold the segments in position during expansion forming of the end section 12 of the pipe end 10.
  • the forming tool 14 is removed by first detaching the tail section 31 from the mandrel section 17.
  • the ribs 33 and extension piece 35 which are fixedly attached _to the tail section 31, slide out of the holes 39 in each of the segments 50, 52, 54, and 56.
  • segments 54 and 56 are now able to move inwardly of the expanded pipe end 16 to collapse the forming tool 14 and allow removal of segments 54 and 56. Once segments 54 and 56 have moved radially inwardly, the remaining segments 50 and 52 are then free to move and be removed.
  • a choking means 22 typically in the form of a steel wire, is used to locally restrict the diameter of one or more areas along the length of the heated end portion 12 during expansion forming.
  • the choking means may be positioned prior to heating of the end section, during expansion forming and/or during cooling of the expanded end section 16.
  • one suitable area of reduced cross- section is located adjacent to the non-pressure side 24 of the annulus 18.
  • the use of the choking means 22 enable an localised area of restricted cross-section to be generated in a simple fashion during expansion forming. This area of restricted cross- section then serves as a shoulder or stop to resist blow-out of the annulus 18 when the pipe end is pressurised in use. The annulus 18 is then able to be used effectively as a thrust ring for a seal 28 located on the pressure side 26 of the annulus 18.
  • Figure 5 illustrates a second pipe joined to an expanded end portion 16 of a first pipe and sealed using seal 28.
  • One or more of the choking means 22 may be provided wherever a reduced cross-section is required to provide such a stop or shoulder at any section along the length of the expanded portion 16.
  • the annuli 18 and/or the choking means 22 also be used to assist in maintaining the concentricity of the expanded end portion 16.
  • joiners of semi-crystalline polymer sections may be produced in small volumes at low price without machining or relying on injection moulding;
  • an existing pipe end of a pipe line may be heated and joined by means of the use of a joiner or a second pipe end in order to reduce installation time on site;
  • joiners made of semi-crystalline polymers may be produced for very low tooling price and without machining;
  • the expansion may be conducted either by applying an external force to increase the diameter of the end portion 12 or by means of inserting a forming tool 14 within the end portion 12 of the pipe end 10.
  • the forming tool 14 may be in the form of an end portion of a second pipe end which may be expanded in the manner described above using the end section of a second polyethylene pipe of similar or greater cross-section as the forming tool 14. All such variations and modifications are to be considered within the scope of the present invention, - li the nature of which is to be determined from the foregoing description and the appended claims .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

L'invention concerne un procédé de précontrainte d'extrémité de tuyau en polymère semicristallin formée par expansion, qui tire parti des propriétés de retrait variables de ce type de matériau. Une partie de l'extrémité de tuyau est chauffée aux fins d'écoulement de plastique et formée par expansion autour d'un outil de mise en forme qui, selon une variante, est repliable. Un dispositif de maintien de forme est inséré dans une ou plusieurs zones de la partie d'extrémité expansée, ce qui permet de maintenir les dimensions telles que formées de la ou des zones considérées. Ce dispositif permet de résister à tout retrait supplémentaire de la partie expansée, alors qu'un tel retrait interviendrait normalement pour soulager les contraintes internes apparaissant en cours de refroidissement, et on exerce ainsi une précontrainte sur l'extrémité de tuyau.
PCT/AU2003/001414 2002-10-25 2003-10-24 Procede de precontrainte de raccords de tuyaux en polymere semicristallin Ceased WO2004037517A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003273626A AU2003273626A1 (en) 2002-10-25 2003-10-24 Method of pre-stressing semi-crystalline polymer pipe joiners

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2002952252 2002-10-25
AU2002952252A AU2002952252A0 (en) 2002-10-25 2002-10-25 Method of pre-stressing semi-crystalline polymer pipe ends

Publications (1)

Publication Number Publication Date
WO2004037517A1 true WO2004037517A1 (fr) 2004-05-06

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PCT/AU2003/001414 Ceased WO2004037517A1 (fr) 2002-10-25 2003-10-24 Procede de precontrainte de raccords de tuyaux en polymere semicristallin

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929958A (en) * 1971-04-26 1975-12-30 Rieber & Son Plastic Ind As Process for producing radially-expanded socket ends on thermoplastic pipe lengths
WO1989000492A1 (fr) * 1987-07-16 1989-01-26 Giuseppe Tassinari Procede permettant de former des tubulures de raccordement stables dans des tubes de polyethylene, avec ou sans renforcement
NL9400894A (nl) * 1994-06-01 1996-01-02 Wavin Bv Werkwijze en inrichting voor het vormen van een mof aan een buis van biaxiaal georiënteerd thermoplastisch kunststofmateriaal.
WO1997010942A1 (fr) * 1995-09-20 1997-03-27 Uponor B.V. Procede pour manchonner un tuyau
JPH09183160A (ja) * 1995-12-28 1997-07-15 Takanori Yamanami 合成樹脂製管の接続方法
JPH09193250A (ja) * 1996-01-17 1997-07-29 Takanori Yamanami 合成樹脂製管の接続方法
EP0963833A1 (fr) * 1998-06-11 1999-12-15 S.I.C.A. SERRANDE INFISSI CARPENTERIA ATTREZZATURA S.p.A. Outil ayant plusieurs fonctions pour la formation de tulipes dimensionnellement stables aux extrémités de tubes thermoplastiques

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929958A (en) * 1971-04-26 1975-12-30 Rieber & Son Plastic Ind As Process for producing radially-expanded socket ends on thermoplastic pipe lengths
WO1989000492A1 (fr) * 1987-07-16 1989-01-26 Giuseppe Tassinari Procede permettant de former des tubulures de raccordement stables dans des tubes de polyethylene, avec ou sans renforcement
NL9400894A (nl) * 1994-06-01 1996-01-02 Wavin Bv Werkwijze en inrichting voor het vormen van een mof aan een buis van biaxiaal georiënteerd thermoplastisch kunststofmateriaal.
WO1997010942A1 (fr) * 1995-09-20 1997-03-27 Uponor B.V. Procede pour manchonner un tuyau
JPH09183160A (ja) * 1995-12-28 1997-07-15 Takanori Yamanami 合成樹脂製管の接続方法
JPH09193250A (ja) * 1996-01-17 1997-07-29 Takanori Yamanami 合成樹脂製管の接続方法
EP0963833A1 (fr) * 1998-06-11 1999-12-15 S.I.C.A. SERRANDE INFISSI CARPENTERIA ATTREZZATURA S.p.A. Outil ayant plusieurs fonctions pour la formation de tulipes dimensionnellement stables aux extrémités de tubes thermoplastiques

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; Class A32, AN 1996-067551/07 *
DATABASE WPI Derwent World Patents Index; Class A35, AN 1997-410356/38 *
DATABASE WPI Derwent World Patents Index; Class A88, AN 1997-430417/40 *

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