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EP0927099A1 - Procede et dispositif permettant de fabriquer des tuyaux plastiques sans pression mecanique sur la paroi interne du tuyau - Google Patents

Procede et dispositif permettant de fabriquer des tuyaux plastiques sans pression mecanique sur la paroi interne du tuyau

Info

Publication number
EP0927099A1
EP0927099A1 EP97921550A EP97921550A EP0927099A1 EP 0927099 A1 EP0927099 A1 EP 0927099A1 EP 97921550 A EP97921550 A EP 97921550A EP 97921550 A EP97921550 A EP 97921550A EP 0927099 A1 EP0927099 A1 EP 0927099A1
Authority
EP
European Patent Office
Prior art keywords
wall
pipe
pipe wall
mold tunnel
walls
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.)
Withdrawn
Application number
EP97921550A
Other languages
German (de)
English (en)
Inventor
Manfred Arno Alfred Lupke
Stefan A. Lupke
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0927099A1 publication Critical patent/EP0927099A1/fr
Withdrawn legal-status Critical Current

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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
    • B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
    • B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29D23/18—Pleated or corrugated hoses

Definitions

  • the present invention relates to a method and apparatus for making double wall plastic pipe.
  • the inner and outer pipe walls are formed separately from one another within a mold tunnel.
  • a mechanical assist and principally a cooling plug is used to force the inner pipe wall against the outer pipe wall to secure the two pipe walls to one another. This slows down production of the pipe through the drag created by the contact between the plug and the inner pipe wall and also produces distortions on the inner surface of the pipe wall. When the pipe is in use, these distortions are extremely detrimental as they create undesirable build up or collection areas for product passing through the pipe.
  • the present invention provides a method of making double wall plastic pipe where the inner and outer pipe walls are adhered to one another without using mechanical pressure to hold the inner pipe wall against the outer pipe wall.
  • separate streams of molten plastic are extruded into a mold tunnel to form the inner and outer pipe walls and the inner pipe wall is forced outwardly against the outer pipe wall by gas pressure produced internally of the inner pipe wall and acting on the inner pipe wall while the pipe is in the mold tunnel.
  • gas pressure internally of the inner pipe wall does not produce scratching or other type of marking on the inside surface of the inner pipe wall and further substantially produces production speed of the pipe.
  • Figure 1 is a schematic view of a pipe manufacturing apparatus
  • Figure 2 is a sectional view showing preferred features of the pipe forming apparatus of Figure 1.
  • FIG 1 shows the general outlines of a pipe manufacturing apparatus which includes an extruder die 1 at the upstream end of the apparatus and a pipe forming mold tunnel down stream of the extruder die.
  • Double wall pipe P emerges from the downstream end of the mold tunnel.
  • This pipe as better seen in Figure 2 of the drawings, comprises a profiled and in this case, corrugated outer wall 6 with a flat inner wall 8 secured or adhered to the troughs of the outer wall.
  • the adhesion occurs because the two walls meet with one another in a molten state and once cooled remain secured to one another as is known in the art.
  • the method of the present invention does not use a mechanical assist to physically hold the inner wall against the outer wall while the pipe is in the mold tunnel.
  • gas pressure is produced to force the inner wall outwardly against the outer wall.
  • Figure 2 shows the extruder die as having a first extrusion orifice 5 through which a stream of molten plastic is fed to the rib forming profile on the inner surface of the mold tunnel 3 to form the outer pipe wall 6. Also provided is a second extrusion orifice 7 downstream of the first extrusion orifice 5 which feeds a second stream of molten plastic to form the interior pipe wall 8.
  • a small lip 4 is provided at the second extrusion orifice to guide the inner wall forming stream of plastic outwardly towards the outer wall forming stream of plastic as the two streams leave the die head.
  • this lip or guide is not required and although the lip applies a slight momentary pressure on the plastic, it is no way maintains pressure to hold the inner wall against the outer wall while the two walls are fusing together.
  • Pressure is however applied to force the inner wall 8 outwardly against the troughs of the outer wall 6 as the plastic starts to cure and harden in the mold tunnel.
  • This pressure is created by gas or air pressure within the mold tunnel.
  • the die head has a passage 18 which opens to the outside atmosphere and a fan 17 is provided to push air into the mold tunnel through passage 18.
  • a baffle 15 is provided interiorly of the inner pipe wall 8. Although there is sufficient clearance to avoid contact between the inner pipe wall and baffle 15, the baffle does act as a block to maintain much of this pressure on the upstream side of the baffle. This pressure is sufficient to hold the inner wall against the outer wall while the two walls cure with one another.
  • the pressure provided inside the inner pipe wall must be sufficient to hold the inner wall against outer wall overcoming the pressure within the pockets 9 between the inner pipe wall and the crests of the outer pipe wall.
  • the pressure inside the inner wall will generally be slightly greater than the pressure within the pockets.
  • a cap 19 can be applied to the end of the pipe and this cap again acts as a block to prevent escape of the gas or air pressure built up inside the pipe.
  • the positive air pressure can also be produced from the downstream end and forced towards the upstream end of the system in which case the end cap, the baffle and the path through the die head would not be used.
  • Figure 2 also shows the use of a cooling coil 13 which cools the air internally of the inner pipe wall. This decreases curing or hardening time for the inner pipe wall but in no way provides anything in the way of mechanical pressure against the inner pipe wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Procédé qui permet de fabriquer un tuyau plastique (8) à double paroi, comprenant une paroi interne (8) et une paroi externe (5) collées l'une à l'autre, sans presser mécaniquement la paroi interne contre la paroi externe. Selon le procédé, on extrude des flux séparés de plastique fondu dans un tunnel de moulage (3), de façon à former les parois interne et externe, puis on produit une pression de gaz positive, qui agit sur la face intérieure de la paroi interne (8) et la pousse vers l'extérieur contre la paroi externe (5), pendant que l'on forme le tuyau dans le tunnel de moulage (3).
EP97921550A 1997-05-20 1997-05-20 Procede et dispositif permettant de fabriquer des tuyaux plastiques sans pression mecanique sur la paroi interne du tuyau Withdrawn EP0927099A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1997/000332 WO1998052739A1 (fr) 1997-05-20 1997-05-20 Procede et dispositif permettant de fabriquer des tuyaux plastiques sans pression mecanique sur la paroi interne du tuyau

Publications (1)

Publication Number Publication Date
EP0927099A1 true EP0927099A1 (fr) 1999-07-07

Family

ID=4173215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97921550A Withdrawn EP0927099A1 (fr) 1997-05-20 1997-05-20 Procede et dispositif permettant de fabriquer des tuyaux plastiques sans pression mecanique sur la paroi interne du tuyau

Country Status (4)

Country Link
EP (1) EP0927099A1 (fr)
CA (1) CA2261073A1 (fr)
DE (1) DE29723138U1 (fr)
WO (1) WO1998052739A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2412066A1 (fr) * 2002-11-18 2004-05-18 Manfred A. A. Lupke Appareil de moulage de tuyaux a turbulence d'air dans le tunnel de moulage

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT188510B (de) * 1951-08-14 1957-01-25 Huber & Drott Verfahren und Vorrichtung zur Herstellung von schrumpffähigen Schläuchen
FR1088125A (fr) * 1953-11-27 1955-03-03 Procédé de confection en continu d'articles complexes tubulaires à partir de matières extrudables et de matières fibreuses, et les articles obtenus
US3286305A (en) * 1964-09-03 1966-11-22 Rexall Drug Chemical Apparatus for continuous manufacture of hollow articles
FR2171844B1 (fr) * 1970-05-14 1974-05-24 Lefebvre Pierre
DE2523975A1 (de) * 1975-05-30 1976-12-16 Veba Chemie Ag Vorrichtung zur herstellung spannungsarmer rohre aus thermoplastischem kunststoff
DE2753103A1 (de) * 1977-11-29 1979-06-07 Roehm Gmbh Verfahren und vorrichtung zur herstellung eines folienbeschichteten hohlprofilstranges aus kunststoff
US4211525A (en) * 1978-12-05 1980-07-08 Rohm Gmbh Apparatus for making stretched, hollow shaped strands having corrugated intermediate supports
US4305703A (en) * 1980-09-12 1981-12-15 Lupke Manfred Arno Alfred Composite die assembly for use in the production of thermoplastic tubing
CA1172813A (fr) * 1982-06-16 1984-08-21 Lupke, Manfred A. A. Dispositif pour la production de tubes multiparoi en matiere thermoplastique
JPS59138418A (ja) * 1983-01-27 1984-08-08 Toyobo Co Ltd ブロ−成形プラスチツクパイプの製造方法および装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9852739A1 *

Also Published As

Publication number Publication date
WO1998052739A1 (fr) 1998-11-26
CA2261073A1 (fr) 1998-11-26
DE29723138U1 (de) 1998-08-06

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