WO1985003251A1 - Procede de fabrication d'un tube en plastique - Google Patents

Procede de fabrication d'un tube en plastique Download PDF

Info

Publication number
WO1985003251A1
WO1985003251A1 PCT/SE1985/000030 SE8500030W WO8503251A1 WO 1985003251 A1 WO1985003251 A1 WO 1985003251A1 SE 8500030 W SE8500030 W SE 8500030W WO 8503251 A1 WO8503251 A1 WO 8503251A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
section
heated
blank
point
Prior art date
Application number
PCT/SE1985/000030
Other languages
English (en)
Inventor
Yngve Lundequist
Original Assignee
Wirsbo Bruks Aktiebolag
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 Wirsbo Bruks Aktiebolag filed Critical Wirsbo Bruks Aktiebolag
Publication of WO1985003251A1 publication Critical patent/WO1985003251A1/fr

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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/02—Thermal shrinking
    • B29C61/025—Thermal shrinking for the production of hollow or 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/04—Thermal expansion
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes

Definitions

  • the present invention relates to a method of manufacturing a plastic tube.
  • the method is primarily intended for manufacturing a flexible plastic tube which has a comparatively large collar and, for example, is suited for connecting a dish washing machine to a water pipe.
  • the main object of the invention is to provide a simple method of manufacturing a plastic tube having at least one end with another outside and
  • the method can generally be used for manufacturing plastic tubes having at least one section with a different outside and
  • the connecting tube 10 shown on the drawing comprises a thinner section 10A and a thicker section 10B.
  • the thin tube section 10A is at its free end provided with a connection means comprising a nut 11 and a packing ring 12.
  • the nut and the packing ring abut from opposite sides a collar 13 provided on the tube section.
  • the nut is provided with internal threads and is intended to be attached by screwing on the end of a connection tube 14 of a dish washing machine.
  • the packing ring 12 will then be sealingly positioned between the collar 13 of the tube section 10A and the end of the connection tube 14.
  • the thick tube section 10B is also at its free end provided with a connection means comprising a nut 15 and a packing ring 16.
  • the nut and the packing ring abut from opposite sides a collar 17 provided on the tube section.
  • the nut 15 is provided with internal threads and is intended to be attached by screwing on the end of a water pipe 18.
  • the packing ring 16 will then be sealingly positioned between the collar 17 of the tube section 10B and the end of the water pipe 18.
  • the plastic tube is at both ends provided with projecting portions 19 and 20, respectively, in front of the collars 13 and 17, respectively. These projecting portions 19,20 are intended for controlling and retaining the packing rings 12 and 16, respectively.
  • the thick tube section 10B is bent to an angle of 90°. In the connecting tube shown on the drawing the section 10A has an outside diameter of 10 millimetres and the section 10B an outside diameter of 12 millimetres.
  • the connecting tube shown on the drawing has been manufactured in the following way.
  • a tube blank in the shape of a tube having an outside diameter of 12 millimetres has first been manufactured of a plastic material having memory characteristics, i. e. of a plastic material having the feature that it after a change of shape resumes the original shape when heated to a particular temperature, the so called crystalline melting-point.
  • the tube blank has then been reduced by drawing, so that the outside diameter of the tube has become 10 millimetres.
  • After the reduction the end sections of the tube have been heated to the crystalline melting-point. These sections have then resumed the original size, i. e. an outside diameter of 12 millimetres.
  • a collar has then been formed in a conventional way at both ends of the tube. At one end only the portion intended for forming the collar has been heated, while at the other end a longer portion has been heated for forming the section 10B. This end section 10B has been bent to an angle of 90° to the shape shown on the drawing.
  • the tube consists of cross-linked polyethylene that has a crystalline melting-point of about 130°C.
  • the collar 17 provided at the free end of the thicker section 10B has a substantially larger diameter than the collar 13 provided at the free end of the thinner section 10A.
  • This larger diameter can easily be provided, because the collar is formed on a tube having a larger outside diameter. Therefore, the collar can easily be made sufficiently large to fit the tube dimensions normally used for water pipes and required for connecting machines, so that leakageproof connections can be provided.
  • the connecting tube 10 has a sufficient flexability due to the fact that the section 10A has a smaller outside diameter and, thus, is thinner. While only one example of the method according to the invention has been given above, it is evident that many variations and modifications are possible within the scope of the invention.
  • the initially manufactured tube blank can for example be machined in such a way that the wall thickness is maintained or changed.
  • the outside diameter of the tube can be reduced, maintained or increased.
  • a section of a tube for example, can be provided with a thicker wall than the rest of the tube by heating to the crystalli- ne melting-point.
  • This possibility can be utilized for manufacturing a tube having thicker walls at the tube ends, so that the ends of the tube easier can be provided with internal or external threads for connection purposes.
  • any portion or section of the reduced tube can be heated to the crystalline melting-point, so that this portion or section resumes the original shape and thus obtains other dimensions than the rest of the tube.
  • the inside diameter can be varied and several sections of the reduced tube can be heated to the crystalline melting- point.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

Dans un procédé de fabrication d'un tube en plastique, un flan de tube possédant des diamètres intérieur et extérieur essentiellement constants est tout d'abord fabriqué à partir d'une matière plastique dotée de caractéristiques de mémoire de forme. Ce flan de tube est ensuite chauffé et refaçonné pour donner un tube (10) doté d'un diamètre extérieur différent et/ou d'un diamètre intérieur différent. Au moins une section (10B) du tube est ensuite chauffée au point de fusion cristalline de la matière plastique. Cette section de tube reprend alors les dimensions du flan de tube, si bien que le tube possède au moins deux sections (10A, 10B) possédant des diamètres intérieur et/ou extérieur différents. En étirant le tube pour lui donner un diamètre extérieur réduit, il est possible d'obtenir un tube doté d'une section plus mince (10A) et d'une section plus épaisse (10B) en le chauffant au point de fusion cristalline. La section plus mince confère au tube une flexibilité accrue, alors que la section plus épaisse permet mieux de doter le tube d'un collier large (17) pour connecter le tube à un autre élément de connexion, par exemple une conduite d'eau (18).
PCT/SE1985/000030 1984-01-27 1985-01-25 Procede de fabrication d'un tube en plastique WO1985003251A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8400399-5 1984-01-27
SE8400399A SE451249B (sv) 1984-01-27 1984-01-27 Forfarande for framstellning av ett lettbojligt plastror med atminstone en krage

Publications (1)

Publication Number Publication Date
WO1985003251A1 true WO1985003251A1 (fr) 1985-08-01

Family

ID=20354472

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1985/000030 WO1985003251A1 (fr) 1984-01-27 1985-01-25 Procede de fabrication d'un tube en plastique

Country Status (4)

Country Link
ES (1) ES8606118A1 (fr)
IT (1) IT1182376B (fr)
SE (1) SE451249B (fr)
WO (1) WO1985003251A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0475126A2 (fr) * 1990-09-12 1992-03-18 Courtaulds Packaging Inc. Méthode pour le formage de l'extrémité d'un tube en matière thermoplastique
WO1994008772A1 (fr) * 1992-10-21 1994-04-28 Helfried Schnallinger Procede de fabrication de pieces moulees en matieres plastiques moulables a l'etat chaud
US5622670A (en) * 1993-05-14 1997-04-22 Rowley; William Process for fabricating crosslinked polyethylene tubing ends
WO1998014318A1 (fr) * 1996-10-03 1998-04-09 Rowley William W Gaine en cuivre a paroi mince pour conduites entierement fabriquees en plastique
US6070916A (en) * 1993-05-14 2000-06-06 Rowley; William W. Crosslinked polyethylene tubing ends
US6485666B1 (en) 1998-03-11 2002-11-26 William W. Rowley Post extrusion profile processing
US6557907B2 (en) 1993-05-14 2003-05-06 William W. Rowley Polyethylene connectors
US6848719B2 (en) 2001-09-06 2005-02-01 William W. Rowley Bendable polymer-lined water heater connector
US6860524B1 (en) 1993-05-14 2005-03-01 William W. Rowley Polyolefin connectors

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1349700A (fr) * 1960-07-15 1964-01-17 Raychem Corp Procédé et appareil pour produire des matières à mémoire plastique
DE2154667A1 (de) * 1970-11-03 1972-06-29 Raychem Corp Wärmeerholbares Element
US3746003A (en) * 1970-04-20 1973-07-17 American Hospital Supply Corp Multi-lumen balloon catheter
US3755524A (en) * 1970-10-26 1973-08-28 Climate Conditioning Corp Method for making pipe reducers
US3926459A (en) * 1972-12-22 1975-12-16 Jacques Pontigny Dilatable tube, method for its production and applications thereof
DK136460B (da) * 1970-01-22 1977-10-17 Braas & Co Gmbh Fremgangsmade til fremstilling af formstofror
DE3024284A1 (de) * 1980-06-27 1982-01-21 Modest S. Moskva Akutin Vorrichtung zur aufweitung von bei erwaermung schwindenden polymeren rohren
DE3152022A1 (de) * 1981-01-26 1982-11-04 Wirsbo Pex, Zweigniederlassung der Platzer Schwedenbau GmbH, 6056 Heusenstamm Verfahren zur herstellung von kunststoffverformungen sowie rohrformstuecken

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1349700A (fr) * 1960-07-15 1964-01-17 Raychem Corp Procédé et appareil pour produire des matières à mémoire plastique
DK136460B (da) * 1970-01-22 1977-10-17 Braas & Co Gmbh Fremgangsmade til fremstilling af formstofror
US3746003A (en) * 1970-04-20 1973-07-17 American Hospital Supply Corp Multi-lumen balloon catheter
US3755524A (en) * 1970-10-26 1973-08-28 Climate Conditioning Corp Method for making pipe reducers
DE2154667A1 (de) * 1970-11-03 1972-06-29 Raychem Corp Wärmeerholbares Element
US3926459A (en) * 1972-12-22 1975-12-16 Jacques Pontigny Dilatable tube, method for its production and applications thereof
DE3024284A1 (de) * 1980-06-27 1982-01-21 Modest S. Moskva Akutin Vorrichtung zur aufweitung von bei erwaermung schwindenden polymeren rohren
DE3152022A1 (de) * 1981-01-26 1982-11-04 Wirsbo Pex, Zweigniederlassung der Platzer Schwedenbau GmbH, 6056 Heusenstamm Verfahren zur herstellung von kunststoffverformungen sowie rohrformstuecken

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0475126A2 (fr) * 1990-09-12 1992-03-18 Courtaulds Packaging Inc. Méthode pour le formage de l'extrémité d'un tube en matière thermoplastique
EP0475126A3 (en) * 1990-09-12 1993-01-13 Courtaulds Packaging Inc. Method of forming a headed thermoplastic tube
WO1994008772A1 (fr) * 1992-10-21 1994-04-28 Helfried Schnallinger Procede de fabrication de pieces moulees en matieres plastiques moulables a l'etat chaud
US5861200A (en) * 1993-05-14 1999-01-19 Rowley; William Thin wall copper sleeve for all plastic conduit
US5622670A (en) * 1993-05-14 1997-04-22 Rowley; William Process for fabricating crosslinked polyethylene tubing ends
US6070916A (en) * 1993-05-14 2000-06-06 Rowley; William W. Crosslinked polyethylene tubing ends
US6557907B2 (en) 1993-05-14 2003-05-06 William W. Rowley Polyethylene connectors
US6860524B1 (en) 1993-05-14 2005-03-01 William W. Rowley Polyolefin connectors
EP0883476A1 (fr) * 1996-01-19 1998-12-16 William W. Rowley Procede de fabrication de raccords de tuyaux en polyethylene reticule
EP0883476A4 (fr) * 1996-01-19 2001-10-10 William W Rowley Procede de fabrication de raccords de tuyaux en polyethylene reticule
WO1998014318A1 (fr) * 1996-10-03 1998-04-09 Rowley William W Gaine en cuivre a paroi mince pour conduites entierement fabriquees en plastique
US6485666B1 (en) 1998-03-11 2002-11-26 William W. Rowley Post extrusion profile processing
US6848719B2 (en) 2001-09-06 2005-02-01 William W. Rowley Bendable polymer-lined water heater connector

Also Published As

Publication number Publication date
SE8400399L (sv) 1985-07-28
IT8567064A1 (it) 1986-07-24
IT1182376B (it) 1987-10-05
ES539806A0 (es) 1986-04-01
IT8567064A0 (it) 1985-01-24
ES8606118A1 (es) 1986-04-01
SE8400399D0 (sv) 1984-01-27
SE451249B (sv) 1987-09-21

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Designated state(s): AT BE CH DE FR GB LU NL SE

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