WO1997033739A1 - Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride - Google Patents

Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride Download PDF

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Publication number
WO1997033739A1
WO1997033739A1 PCT/NL1997/000117 NL9700117W WO9733739A1 WO 1997033739 A1 WO1997033739 A1 WO 1997033739A1 NL 9700117 W NL9700117 W NL 9700117W WO 9733739 A1 WO9733739 A1 WO 9733739A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
end section
socket
support
heating
Prior art date
Application number
PCT/NL1997/000117
Other languages
French (fr)
Inventor
Jan Visscher
Original Assignee
Wavin B.V.
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 Wavin B.V. filed Critical Wavin B.V.
Priority to DK97908578T priority Critical patent/DK0886572T3/en
Priority to NZ331121A priority patent/NZ331121A/en
Priority to JP9532463A priority patent/JP2000506455A/en
Priority to BR9707971A priority patent/BR9707971A/en
Priority to AT97908578T priority patent/ATE194098T1/en
Priority to EP97908578A priority patent/EP0886572B1/en
Priority to AU20453/97A priority patent/AU726006B2/en
Priority to PL97328770A priority patent/PL181789B1/en
Priority to DE69702386T priority patent/DE69702386T2/en
Publication of WO1997033739A1 publication Critical patent/WO1997033739A1/en
Priority to US09/150,651 priority patent/US6146572A/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
    • 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
    • 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
    • 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
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06—PVC, i.e. polyvinylchloride
    • 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
    • B29K2995/005—Oriented
    • 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
    • B29K2995/005—Oriented
    • B29K2995/0053—Oriented bi-axially
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/65—Processes of preheating prior to molding

Definitions

  • the invention relates to a method for forming a socket on a pipe of biaxially oriented polyvinyl chloride according to the preamble of claim 1.
  • the pipe of biaxially oriented polyvinyl chloride may, for example, have been fabricated by means of the methods as described in WO 95/25627, WO 95/25628 and WO 95/30533.
  • the present invention provides a method according to the preamble of claim 1, which is characterized in that, for the purpose of heating the internally supported end section of the pipe, said end section is first heated until said end section has reached, substantially homogeneously, the glass transition temperature of polyvinyl chloride and is then further heated until the end section has reached, substantially homogeneously, a temperature near, preferably just above, the orientation temperature of polyvinyl chloride .
  • the invention therefore proposes that the relevant internally supported end section of the pipe be heated in at least two steps: first to about the glass transition temperature of polyvinyl chloride, which is at 80 - 85 °C, said heating being maintained for a sufficiently long period to ensure that the end section, as seen across the wall thickness, virtually uniformly is at this temperature, and in one or more subsequent steps to a higher temperature which is in the vicinity of the orientation temperature, which is about 110 °C, and preferably to a value somewhat above the orientation temperature, for example to about 120 °C.
  • the heating of the pipe in the region of the end section comprises the external heating of the pipe and/or the heating of the support.
  • the heating means may comprise a heating ring, for example including an infrared radiator, which is situated around the support section of the mandrel, if this has first been inserted into the pipe.
  • the heat output of such a heating ring to the pipe can be controlled in a simple and accurate manner.
  • Figure 1 shows a schematic longitudinal section of an illustrative embodiment of an apparatus for forming a socket on a biaxially oriented pipe during the initial phase of the method according to the invention
  • Figure 2 shows a view corresponding to Figure 1 during the end phase of the method according to the invention
  • Figure 3 shows the variation with time of the temperature of the internally supported end section of the pipe during the heating operation in the manner according to the invention.
  • the apparatus 10 shown in Figures 1 and 2 enables a socket to be formed on a biaxially oriented pipe 11, the socket being provided directly with an elastic sealing ring 12.
  • the apparatus 10 comprises a hollow cylindrical mandrel 13 which is open at one end.
  • the mandrel 13 has a support section 14, a transition section 15 and a socket- forming section 16.
  • the socket-forming section 16 is provided with a circumferential groove 17 on the outside.
  • the apparatus 10 further comprises a support ring 18 which can slide over the socket-forming section 16.
  • the apparatus For the purpose of heating and subsequent cooling of the end section of the pipe 11 to be processed, the apparatus comprises a heating device 20 and a cooling device 22.
  • the fabrication of a socket with sealing ring by means of the apparatus shown in Figures 1 and 2 proceeds as follows. First the sealing ring 12 is pushed over the mandrel 13 until it comes to lie in the relatively shallow groove 17, the support ring 18 bearing against that side of the sealing ring 12 which faces away from the insertion side of the mandrel 13. Then the support section 14 is inserted, for example by a double-acting hydraulic cylinder (not shown) , into the end section of the pipe 11.
  • the pipe 11 Because the biaxially oriented pipe 11 is still warm and therefore has a tendency to shrink in a radial direction, the pipe 11 automatically comes to lie, in the state shown in Figure 2 , against the socket-forming section 16 and then traps the sealing ring 12. Then the end section, still internally supported, of the pipe 11 can be cooled by means of the cooling device 22 and/or by cooling the mandrel 13. Finally, the mandrel 13 can be pulled from the pipe 11 in its entirety, the sealing ring 12 disengaging from the shallow groove 17 of the mandrel 13 and remaining behind in the socket formed.
  • the present invention provides for a special manner of heating the end section, internally supported by the support section 14, of the pipe 11.
  • the variation in temperature against time, as preferentially aimed for, of the end section of the pipe 11 is shown in Figure 3.
  • the heating device 20 is set so as to reach an end section temperature which roughly corresponds to the glass transition temperature of polyvinyl chloride (about 80-85 °C) .
  • This setting of the heating device 20 is maintained for some time, to ensure that the end section of the pipe 11 is at this temperature as uniformly as possible. Only when it can be assumed that this is the case is the heating device 20 set so as to heat the end section of the pipe 11 to a higher temperature.
  • the temperature ultimately to be reached for the end section of the pipe 11 preferably roughly corresponds, according to the invention, to the orientation temperature of polyvinyl chloride (about 110 °C) , preferably slightly above, for example 120 °C.
  • the end section of the pipe 11 has been heated uniformly to the glass transition temperature, it is important, when the end section is heated to a higher temperature, that the temperature differences in the wall of the end section of the pipe 11 be kept within limits. This can be done by the end section being heated stepwise, so that the end section will first uniformly have reached a particular temperature and will only then be heated further once more. Thus it is even possible for the end section to be heated to a higher temperature than is preferable according to the invention, for example to about 135 - 140 °C. If the end section were to be heated in one step from the glass transition temperature to such a high temperature, the probability of cracking is high.

Abstract

The method comprises the successive steps of: placing a support in an end section of the pipe, heating the pipe in the region of the end section; deforming the pipe to produce a socket in the region of the heated end section; the heated end section being supported internally while the socket is being formed; cooling the pipe in the region of the end section, the end section being supported internally during the cooling operation; and removing the support from the pipe, for the purpose of heating the internally supported end section of the pipe, said end section first being heated until said end section has reached, substantially homogeneously, the glass transition temperature of polyvinyl chloride and then being further heated until the end section has reached, substantially homogeneously, a temperature near, preferably just above, the orientation temperature of polyvinyl chloride.

Description

Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride.
The invention relates to a method for forming a socket on a pipe of biaxially oriented polyvinyl chloride according to the preamble of claim 1.
Such a method is disclosed by NL-A-9400894. The pipe of biaxially oriented polyvinyl chloride may, for example, have been fabricated by means of the methods as described in WO 95/25627, WO 95/25628 and WO 95/30533.
In the case of the method disclosed by NL-A- 9400894, an end section of the pipe on which the socket is to be formed, is slipped onto a support section of a mandrel, which support section fits into the pipe. Then the internally supported pipe end section is heated, whereupon a socket-forming mandrel section which adjoins the support section and whose shape substantially corresponds to the intended shape of the socket is forced into the heated end section of the pipe. Finally, the pipe end section still supported by the mandrel is cooled.
It was found that in the case of pipes on which sockets had been formed by means of the known method, cracking occurred in a large number of cases in the socket section of the pipes. These cracks sometimes occurred even while the sockets were being formed, but also if the sockets were subsequently subjected to an impact load.
It is an object of the present invention to provide a method which will afford sockets of better quality.
The present invention provides a method according to the preamble of claim 1, which is characterized in that, for the purpose of heating the internally supported end section of the pipe, said end section is first heated until said end section has reached, substantially homogeneously, the glass transition temperature of polyvinyl chloride and is then further heated until the end section has reached, substantially homogeneously, a temperature near, preferably just above, the orientation temperature of polyvinyl chloride .
In other words, the invention therefore proposes that the relevant internally supported end section of the pipe be heated in at least two steps: first to about the glass transition temperature of polyvinyl chloride, which is at 80 - 85 °C, said heating being maintained for a sufficiently long period to ensure that the end section, as seen across the wall thickness, virtually uniformly is at this temperature, and in one or more subsequent steps to a higher temperature which is in the vicinity of the orientation temperature, which is about 110 °C, and preferably to a value somewhat above the orientation temperature, for example to about 120 °C.
Preferably, the heating of the pipe in the region of the end section comprises the external heating of the pipe and/or the heating of the support.
The heating means may comprise a heating ring, for example including an infrared radiator, which is situated around the support section of the mandrel, if this has first been inserted into the pipe. The heat output of such a heating ring to the pipe can be controlled in a simple and accurate manner.
The invention will be explained hereinafter in more detail with reference to the drawing, in which: Figure 1 shows a schematic longitudinal section of an illustrative embodiment of an apparatus for forming a socket on a biaxially oriented pipe during the initial phase of the method according to the invention,
Figure 2 shows a view corresponding to Figure 1 during the end phase of the method according to the invention, and
Figure 3 shows the variation with time of the temperature of the internally supported end section of the pipe during the heating operation in the manner according to the invention.
The following description starts from a previously fabricated pipe of biaxially oriented polyvinyl chloride having a smooth, cylindrical wall, which is to be provided with a socket. The apparatus 10 shown in Figures 1 and 2 enables a socket to be formed on a biaxially oriented pipe 11, the socket being provided directly with an elastic sealing ring 12. The apparatus 10 comprises a hollow cylindrical mandrel 13 which is open at one end. The mandrel 13 has a support section 14, a transition section 15 and a socket- forming section 16. The socket-forming section 16 is provided with a circumferential groove 17 on the outside. The apparatus 10 further comprises a support ring 18 which can slide over the socket-forming section 16. For the purpose of heating and subsequent cooling of the end section of the pipe 11 to be processed, the apparatus comprises a heating device 20 and a cooling device 22. The fabrication of a socket with sealing ring by means of the apparatus shown in Figures 1 and 2 proceeds as follows. First the sealing ring 12 is pushed over the mandrel 13 until it comes to lie in the relatively shallow groove 17, the support ring 18 bearing against that side of the sealing ring 12 which faces away from the insertion side of the mandrel 13. Then the support section 14 is inserted, for example by a double-acting hydraulic cylinder (not shown) , into the end section of the pipe 11.
When the end section of the pipe 11 is supported internally by the support section 14 of the mandrel 13, said pipe end section is heated by means of the heating device 20. If required it is possible, via the support section 14 of the mandrel 13, to effect internal heating of the end section of the pipe 11. The internal support by the support section 14 prevents shrinkage, in a radial direction, of the pipe 11 whose plastic material, under the influence of the heating, is trying to revert to the state of the plastic material prior to being oriented biaxially. Some shrinkage in the heated end section does occur in the axial direction. This axial shrinkage of the end section is advantageous, however, because it is thus possible to compensate for the wall becoming thinner in the socket region as a result of the radial expansion yet to be effected. When the end section of the pipe 11 has been suitably heated, the mandrel 13 is pushed further into the pipe 11. At the moment when the sealing ring 12 comes up against the pipe 11, the pipe 11 will be further expanded by the sealing ring 12. The sealing ring 12 is supported, in the process, by the support ring 18 which moves in tandem with the mandrel 13. As a result, the pipe 11 slides over the sealing ring 12 and subsequently over the support ring 18 situated behind it. As soon as the intended position of the socket-forming section 16 in the tube 11 has been reached, the support ring 18 is drawn backwards out of the pipe 11, by means which are likewise not shown, to the position shown in Figure 2. Because the biaxially oriented pipe 11 is still warm and therefore has a tendency to shrink in a radial direction, the pipe 11 automatically comes to lie, in the state shown in Figure 2 , against the socket-forming section 16 and then traps the sealing ring 12. Then the end section, still internally supported, of the pipe 11 can be cooled by means of the cooling device 22 and/or by cooling the mandrel 13. Finally, the mandrel 13 can be pulled from the pipe 11 in its entirety, the sealing ring 12 disengaging from the shallow groove 17 of the mandrel 13 and remaining behind in the socket formed.
The present invention provides for a special manner of heating the end section, internally supported by the support section 14, of the pipe 11. The variation in temperature against time, as preferentially aimed for, of the end section of the pipe 11 is shown in Figure 3. In the first instance, the heating device 20 is set so as to reach an end section temperature which roughly corresponds to the glass transition temperature of polyvinyl chloride (about 80-85 °C) . This setting of the heating device 20 is maintained for some time, to ensure that the end section of the pipe 11 is at this temperature as uniformly as possible. Only when it can be assumed that this is the case is the heating device 20 set so as to heat the end section of the pipe 11 to a higher temperature. The temperature ultimately to be reached for the end section of the pipe 11 preferably roughly corresponds, according to the invention, to the orientation temperature of polyvinyl chloride (about 110 °C) , preferably slightly above, for example 120 °C.
For that matter, once the end section of the pipe 11 has been heated uniformly to the glass transition temperature, it is important, when the end section is heated to a higher temperature, that the temperature differences in the wall of the end section of the pipe 11 be kept within limits. This can be done by the end section being heated stepwise, so that the end section will first uniformly have reached a particular temperature and will only then be heated further once more. Thus it is even possible for the end section to be heated to a higher temperature than is preferable according to the invention, for example to about 135 - 140 °C. If the end section were to be heated in one step from the glass transition temperature to such a high temperature, the probability of cracking is high.
Although the mechanism involved is not entirely clear, the abovedescribed manner of heating is found to avoid the inception of undesirable stresses in the socket, which lead to cracking.
It is evident that in the process of forming the socket by the method according to the present invention, other mandrel designs may alternatively be used. One possibility, for example, is that of a radially expandable mandrel.

Claims

1. Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride, comprising the successive steps of: placing a support in an end section of the pipe, - heating the pipe in the region of the end section, deforming the pipe to produce a socket in the region of the heated end section, the heated end section being supported internally while the socket is being formed, - cooling the pipe in the region of the end section, the end section being supported internally during the cooling operation, and removing the support from the pipe, characterized in that: - for the purpose of heating the internally supported end section of the pipe, said end section is first heated until said end section has reached, substantially homogeneously, the glass transition temperature of polyvinyl chloride and is then further heated until the end section has reached, substantially homogeneously, a temperature near, preferably just above, the orientation temperature of polyvinyl chloride.
2. Method according to claim 1, wherein the placing of a support in the end section of the pipe comprises a support section of a rigid mandrel being inserted into the end section, and
- the deformation of the pipe to produce a socket in the region of the end section comprises a socket-forming section, which adjoins the support section, of the rigid mandrel being forced into the pipe.
3. Method according to claim 1 or 2, wherein the heating of the pipe in the region of the end section comprises the external heating of the pipe and/or the heating of the support.
4. Method according to one or more of the preceding claims, wherein the cooling of the pipe in the region of the end section comprises the external cooling of the pipe and/or the cooling of the support.
PCT/NL1997/000117 1996-03-13 1997-03-10 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride WO1997033739A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DK97908578T DK0886572T3 (en) 1996-03-13 1997-03-10 Process for forming a sleeve on a biaxially oriented polyvinyl chloride tube
NZ331121A NZ331121A (en) 1996-03-13 1997-03-10 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride
JP9532463A JP2000506455A (en) 1996-03-13 1997-03-10 Method for molding sockets in biaxially stretched polyvinyl chloride tubes
BR9707971A BR9707971A (en) 1996-03-13 1997-03-10 Socket forming method in a biaxially oriented polyvinyl chloride tubing
AT97908578T ATE194098T1 (en) 1996-03-13 1997-03-10 METHOD FOR FORMING A SLEEVE ON A BIAXIALLY ORIENTED POLYVINYL CHLORIDE PIPE
EP97908578A EP0886572B1 (en) 1996-03-13 1997-03-10 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride
AU20453/97A AU726006B2 (en) 1996-03-13 1997-03-10 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride
PL97328770A PL181789B1 (en) 1996-03-13 1997-03-10 Method of forming a socket in a bi-axially oriented pvc pipe
DE69702386T DE69702386T2 (en) 1996-03-13 1997-03-10 METHOD FOR SHAPING A SLEEVE ON A BIAXIAL-ORIENTED POLYVINYL CHLORIDE TUBE
US09/150,651 US6146572A (en) 1996-03-13 1998-09-09 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1002604A NL1002604C2 (en) 1996-03-13 1996-03-13 Method of forming a sleeve on a tube of biaxially oriented polyvinyl chloride.
NL1002604 1996-03-13

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/150,651 Continuation US6146572A (en) 1996-03-13 1998-09-09 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride

Publications (1)

Publication Number Publication Date
WO1997033739A1 true WO1997033739A1 (en) 1997-09-18

Family

ID=19762494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1997/000117 WO1997033739A1 (en) 1996-03-13 1997-03-10 Method for forming a socket on a pipe of biaxially oriented polyvinyl chloride

Country Status (16)

Country Link
US (1) US6146572A (en)
EP (1) EP0886572B1 (en)
JP (1) JP2000506455A (en)
AT (1) ATE194098T1 (en)
AU (1) AU726006B2 (en)
BR (1) BR9707971A (en)
CA (1) CA2248208A1 (en)
CZ (1) CZ247298A3 (en)
DE (1) DE69702386T2 (en)
DK (1) DK0886572T3 (en)
ES (1) ES2148940T3 (en)
NL (1) NL1002604C2 (en)
NZ (1) NZ331121A (en)
PL (1) PL181789B1 (en)
PT (1) PT886572E (en)
WO (1) WO1997033739A1 (en)

Cited By (7)

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WO1999042279A1 (en) * 1998-02-19 1999-08-26 Wavin B.V. Method and device for forming a socket on a pipe of thermoplastic material
WO2000007803A1 (en) 1998-08-07 2000-02-17 Wavin B.V. Socket joint of plastic pipe sections
NL1012032C2 (en) * 1999-03-05 2000-09-06 Wavin Bv Method for manufacturing a tube of biaxially oriented thermoplastic plastic material.
US6838041B2 (en) * 1998-03-11 2005-01-04 William W. Rowley Post formation profile processing
CN1304187C (en) * 2000-08-02 2007-03-14 韦文有限公司 Method and device for production of pipe from biaxially oriented thermoplastic material having integrated socket
IT202100008615A1 (en) 2021-04-07 2022-10-07 Sica Spa BELLING UNIT, AUTOMATIC BELLING MACHINE INCLUDING SUCH UNIT AND METHOD OF BELLING PVC-O PIPES
IT202100008630A1 (en) 2021-04-07 2022-10-07 Sica Spa METHOD AND MACHINE FOR BELLING PVC-O PIPES

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US6220846B1 (en) * 1998-01-19 2001-04-24 Sica S.P.A. Apparatus for expanding and conferring a cup shape to the terminal junction segment of bi-axially oriented pipes made of thermoplastic material
WO2006094361A1 (en) * 2005-03-11 2006-09-14 Vinidex Pty Limited Socketing of pipe
US9913958B2 (en) * 2014-02-28 2018-03-13 Abbott Cardiovascular Systems Inc. Protective sheaths for medical devices

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6540955B1 (en) 1998-02-19 2003-04-01 Wavin B.V. Process of making a socket on a pipe of thermoplastic material
WO1999042279A1 (en) * 1998-02-19 1999-08-26 Wavin B.V. Method and device for forming a socket on a pipe of thermoplastic material
AU746800B2 (en) * 1998-02-19 2002-05-02 Wavin B.V. Method and device for forming a socket on a pipe of thermoplastic material
US6838041B2 (en) * 1998-03-11 2005-01-04 William W. Rowley Post formation profile processing
WO2000007803A1 (en) 1998-08-07 2000-02-17 Wavin B.V. Socket joint of plastic pipe sections
NL1009822C2 (en) * 1998-08-07 2000-02-23 Wavin Bv Sleeve connection of plastic pipe parts.
NL1012032C2 (en) * 1999-03-05 2000-09-06 Wavin Bv Method for manufacturing a tube of biaxially oriented thermoplastic plastic material.
US6726863B2 (en) 1999-03-05 2004-04-27 Wavin B.V. Thermoplastic tube
WO2000053392A1 (en) * 1999-03-05 2000-09-14 Wavin B.V. Thermoplastic tube
US7217379B2 (en) 1999-03-05 2007-05-15 Wavin B.V. Thermoplastic tube
CN1304187C (en) * 2000-08-02 2007-03-14 韦文有限公司 Method and device for production of pipe from biaxially oriented thermoplastic material having integrated socket
IT202100008615A1 (en) 2021-04-07 2022-10-07 Sica Spa BELLING UNIT, AUTOMATIC BELLING MACHINE INCLUDING SUCH UNIT AND METHOD OF BELLING PVC-O PIPES
IT202100008630A1 (en) 2021-04-07 2022-10-07 Sica Spa METHOD AND MACHINE FOR BELLING PVC-O PIPES

Also Published As

Publication number Publication date
CZ247298A3 (en) 1998-11-11
NL1002604C2 (en) 1997-09-17
JP2000506455A (en) 2000-05-30
AU2045397A (en) 1997-10-01
EP0886572A1 (en) 1998-12-30
EP0886572B1 (en) 2000-06-28
ES2148940T3 (en) 2000-10-16
NZ331121A (en) 2000-02-28
DE69702386T2 (en) 2001-01-04
AU726006B2 (en) 2000-10-26
PL328770A1 (en) 1999-02-15
CA2248208A1 (en) 1997-09-18
DE69702386D1 (en) 2000-08-03
PT886572E (en) 2000-10-31
DK0886572T3 (en) 2000-08-28
BR9707971A (en) 1999-07-27
ATE194098T1 (en) 2000-07-15
US6146572A (en) 2000-11-14
PL181789B1 (en) 2001-09-28

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