EP0363384A1 - Tube en plastique ayant des nervures transversales solides sur la surface exterieure, dispositif de moulage prevu a cet effet, installation comprenant un tel dispositif et procede de moulage d'un tube en plastique - Google Patents

Tube en plastique ayant des nervures transversales solides sur la surface exterieure, dispositif de moulage prevu a cet effet, installation comprenant un tel dispositif et procede de moulage d'un tube en plastique

Info

Publication number
EP0363384A1
EP0363384A1 EP88904276A EP88904276A EP0363384A1 EP 0363384 A1 EP0363384 A1 EP 0363384A1 EP 88904276 A EP88904276 A EP 88904276A EP 88904276 A EP88904276 A EP 88904276A EP 0363384 A1 EP0363384 A1 EP 0363384A1
Authority
EP
European Patent Office
Prior art keywords
tube
smooth
moulds
ribs
moulding
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.)
Pending
Application number
EP88904276A
Other languages
German (de)
English (en)
Inventor
Finn Thor Hansen
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.)
Wavin BV
Original Assignee
Wavin BV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19850017&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0363384(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wavin BV filed Critical Wavin BV
Publication of EP0363384A1 publication Critical patent/EP0363384A1/fr
Pending 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/003—Tubular articles having irregular or rough surfaces

Definitions

  • Plastic tube with solid cross-ribs on the outer surface a moulding device therefor; installation comprising such a device and a method for moulding a plastic tube.
  • the invention relates to a plastic tube with a smooth inner surface and a solid outer surface comprising cross-ribs.
  • Such a tube is known from German Patent Specification 2,709,395.
  • a tube is described together with a moulding of such a tube.
  • the tube described therein has a smooth inner surface and is provided with solid ribs on the rater surface over its entire length.
  • Such a known tube which is provided with ribs over its entire outer surface has the disadvantage that connecting it to other similar sorts of pipes is relatively difficult.
  • the object of the present invention is to provide a tube provided with ribs with a smooth inner surface which is directly suitable for use in all known tube connection methods.
  • a tube is characterized in that at least one end of said tube has a smooth outer surface of p r e de t e r m in e d length, said end having a wall thickness which is greater, equal to or smaller than the smallest wall thickness of the tube between the solid ribs.
  • the wall thickness is greater than the smallest wall thickness of the tube between the solid ribs .
  • a tube end is moulded, on the one hand, which is suitable for all normal joining methods while, on the other hand, said tube end may satisfy, in a simple manner, the required tolerances of roundness and strength.
  • the volume of plastic per length unit of the ribbed section amounts to 0.5 to 1.4 times the volume per length unit of the smooth section; in many cases, however, this ratio may be 1.0.
  • the transition section between the ribbed section of a tube and the smooth section of a tube is generally not sharp, but the transition section will have an incline; said incline is generally between 0 and 90°.
  • the tube according to the invention may then, at its smooth end, be widened in a manner such that an end comprising solid ribs of another tube may be received; the widening may also be produced in a manner such that an unwidened smooth end of another tube may be received.
  • the tube according to the invention will have a smooth outer surface at both ends; one of the two ends will then be widened in a manner such that a smooth end of another tube may be received.
  • the invention also relates to a rib-shaped device for use in an installation for moulding a tube comprising ribs according to the invention as described above, which device comprises at least two series of half- moulds; each half-mould having a half-tube-shaped moulding cavity, and the half-moulds being moveable along tracks, which tracks run parallel to each other over a working path in a manner such that, over said working path, the half-moulds complement each other, during moulding, to an annular mould around a concentrically arranged smooth mandrel.
  • the device according to the invention being characterized in that at least one pair of all pairs of half-moulds is present, at least a section of which has a smooth inner surface, whilst the half-moulds in the remaining pairs have a ribbed inner surface.
  • a device according to the invention it is, furthermore, the case that, in particular, at least one of all pairs of half-moulds is present, at least a section of which has the smooth profile which is not parallel to the surface of the above mentioned smooth mandrel; said section has, at least partially, an incline of between 0 and 90° with respect to the central axis of the device.
  • the sum of the length of all half moulds with a smooth inner surface which is parallel to that of the smooth mandrel is essentially equal to the desired length of the surface of a tube with a smooth outer surface.
  • the volume ratio per length unit of the moulding cavity of the half moulds with a ribbed inner surface around the mandrel to the moulding cavity of the half moulds with a smooth inner surface around the mandrel has a value in the region of 0.5 - 1.4; in many cases, said volume ratio is essentially equal to 1.0.
  • the invention also relates to an installation comprising an extruder and a rib moulding device as described above.
  • the invention relates to a method for producing a tube made from plastic with a smooth inner surface and an outer surface comprising sol id cross-ribs using in an installation according to the invention as has been described above which is characterized in that the extrusion speed and the speed of displacement of the half-moulds of the invention are adjusted in relation to the desired ratio of the volume of plastic per unit length of a tube section with ribs and a tube section with a smooth outer surface and, similarly, the desired ratio of the displacement speed of the half-moulds is adjusted to a value in the region of approximately 0.5 to 1.4 times the extrusion speed.
  • Figure 1 shows a tube according to the invention in cross-section, with a smooth outer surface at one end
  • Figure 2 shows two tubes according to the invention connected together
  • Figure 3 shows a tube provided with solid ribs, a central section having a smooth outer surface
  • Figure 4 shows an installation for moulding a tube provided with ribs
  • Figure 5 shows in plan view a section through a number of half-moulds of a device according to the invention.
  • Figure 1 shows a tube 1 with a smooth inner wall 2 and solid ribs 3 on the outer side.
  • One end of the tube has a smooth outer side 4 while the transition section between the smooth section 4 and the section where the ribs 3 are located is indicated by 6.
  • Figure 2 shows two ribbed tubes connected together, 1 and 1', the smooth section 4 is widened in order to receive the section of the tube 1' provided with ribs; 5 shows that a packing material may be located between the ribs.
  • Figure 3 shows a section of a continuously moulded ribbed tube in which a section of the length has a smooth outer surface 4.
  • the section 4 in the centre may be sawn through; if a smooth outer surface is required at only one end, sawing through may take place at one of the ends of said smooth section 4.
  • Figure 4 shows diagrammatically a device for the continuous moulding of rib tubes comprising a rib moulding device 10 and extruder 13.
  • the rib moulding device comprises two endless belts 11 and 12 on which half-moulds 11' and 12' are mounted.
  • the half-moulds lock together around the smooth end of an extrusion die ring 20 during moulding of an annular hollow form.
  • the tube 22 delivered by le extrusion head 14 at the extrusion die ring 20 has a internal diameter which is smaller than the external diameter of the smooth mandrel 21.
  • the half-moulds 11' and 12' deform the still plastic material, for example polyvinyl chloride, of the tube 22 and give the outer surface of the tube its profile.
  • the moulds provided with a ribbed inner surface give a ribbed tube section 19.
  • the moulds with a smooth inner surface lead to a smooth tube section 18. In all cases, the inner wall of the moulded tube is smooth.
  • the extruder 13 is driven by a drive means 15; the rib moulding device is, as shown diagrammatically, driven by drive means 16.
  • the two drive means are coupled via a control unit 17 which regulates extrusion speed and transport speed of the half-moulds in accordance with a desired ratio of the volume of plastic per length unit of a ribbed tube section and a smooth tube section.
  • the device sketched in Figure 4 shows a single extrusion head to which all necessary plastic is supplied in one delivery.
  • Figure 5 shows three cross-sections of moulds in plan view; mould 30 is a normal mould with r i b s 3 1.
  • Mould 32 is a mould with a ribbed section 33 and a smooth section 35; the transition section 34 has an incline. Mould 36 has a smooth inner surface 37.
  • a tube with an internal diameter of 180 mm with a wall thickness between the ribs of 2.0 mm is moulded in an installation according to the invention.
  • the height of the ribs is 7.8 mm
  • the width of the ribs is 2.55 mm
  • the pitch of the ribs is 16.9 mm.
  • the surface of the cross-section of the tube is, on average.
  • the smooth end should have a wall thickness of 3.7 mm which corresponds with a cross-section of 2134 mm 2 . This may be achieved by changing the ratio of the speeds of extrusion and transport of the half-moulds from 1:1 to 1:0.85 when the half-moulds with smooth inner surface pass through the zone in which the mouthpiece of the extruder supplies a tube.
  • the speed ratio may be returned to 1:1.
  • section means to indicate a length of tube forming a part of the total length of a tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Joints With Sleeves (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

Tube (1) ayant des nervures (3) transversales solides situées à l'extérieur, et une surface intérieure lisse dans lequel au moins une extrémité a une surface (4) extérieure lisse dont l'épaisseur de paroi peut être librement choisie, c'est-à-dire, supérieure, égale ou inférieure à la plus petite épaisseur du tube, entre les nervures. L'invention se rapporte également à un dispositif permettant de mouler un tube selon l'invention, à une installation ayant un tel dispositif, et à un procédé permettant de produire un tube utilisant une telle installation, comprenant un dispositif conforme à l'invention. Dans le dispositif, au moins une partie des demi-moules utilisés au façonnage comprend au moins une surface intérieure lisse correspondant à une partie du tube ayant une surface extérieure lisse.
EP88904276A 1987-05-14 1988-05-11 Tube en plastique ayant des nervures transversales solides sur la surface exterieure, dispositif de moulage prevu a cet effet, installation comprenant un tel dispositif et procede de moulage d'un tube en plastique Pending EP0363384A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8701164 1987-05-14
NL8701164A NL8701164A (nl) 1987-05-14 1987-05-14 Kunststofbuis met aan het buitenoppervlak massieve dwarsribben, inrichting voor toepassing in een installatie voor het vormen van dergelijke buizen; installatie voor het vormen van buizen die een dergelijke inrichting omvat en werkwijze voor het vormen van een kunststofbuis onder toepassing van een dergelijke installatie.

Publications (1)

Publication Number Publication Date
EP0363384A1 true EP0363384A1 (fr) 1990-04-18

Family

ID=19850017

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88200954A Expired - Lifetime EP0291136B2 (fr) 1987-05-14 1988-05-11 Tube en matière plastique présentant des nervures transversales solides sur la surface extérieure, dispositif de moulage, installation comprenant un tel dispositif et méthode de moulage de ce tube
EP88904276A Pending EP0363384A1 (fr) 1987-05-14 1988-05-11 Tube en plastique ayant des nervures transversales solides sur la surface exterieure, dispositif de moulage prevu a cet effet, installation comprenant un tel dispositif et procede de moulage d'un tube en plastique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88200954A Expired - Lifetime EP0291136B2 (fr) 1987-05-14 1988-05-11 Tube en matière plastique présentant des nervures transversales solides sur la surface extérieure, dispositif de moulage, installation comprenant un tel dispositif et méthode de moulage de ce tube

Country Status (9)

Country Link
EP (2) EP0291136B2 (fr)
JP (2) JP2631887B2 (fr)
AT (1) ATE69578T1 (fr)
CA (1) CA1303518C (fr)
DE (1) DE3866277D1 (fr)
DK (1) DK163320C (fr)
FI (1) FI90129C (fr)
NL (1) NL8701164A (fr)
WO (1) WO1988008784A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2205737B (en) * 1987-05-23 1991-04-03 Nat Res Dev Improvements in or relating to chairs
FI83984C (fi) * 1989-04-28 1991-09-25 Uponor Nv Tryckledning.
DE69121410T2 (de) * 1991-06-14 1997-02-20 Manfred Arno Alfred Lupke Maschine mit wanderndem formtunnel zur herstellung glattwandiger rohre
DE4240268A1 (de) * 1992-12-01 1994-06-09 Wilhelm Hegler Verfahren und Vorrichtung zur fortlaufenden Herstellung eines Verbundrohres mit einem außen im wesentlichen glatten Abschnitt

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH560097A5 (fr) * 1972-07-25 1975-03-27 Kagerer Eisen Kunststoff
US4038011A (en) * 1972-12-29 1977-07-26 Lemelson Jerome H Apparatus for forming ribbed tubing
JPS587448B2 (ja) * 1974-09-25 1983-02-09 積水化学工業株式会社 アツニクブト ウスニクブトオ コウゴ ニユウスル ジユシカンノ セイゾウホウホウ
US4003685A (en) * 1974-10-09 1977-01-18 Maroschak Ernest J Apparatus for molding plastic pipe with enlarged portions formed therein
FR2359696A1 (fr) * 1976-07-30 1978-02-24 Pont A Mousson Procede et dispositif pour modifier l'epaisseur d'un corps extrude a debit constant
JPS5630012Y2 (fr) * 1976-09-09 1981-07-17
DE2709395C2 (de) * 1977-03-04 1979-05-23 Reifenhaeuser Kg, 5210 Troisdorf Verfahren und Vorrichtung zum kontinuierlichen Herstellen eines Rippenrohres mit glattem Innenkanal
ZA775528B (en) * 1977-09-15 1979-04-25 Aeci Ltd Plastics pipes and their manufacture
FR2424123A1 (fr) * 1978-04-24 1979-11-23 Armosig Procede et appareillage pour la fabrication en continu de profiles tubulaires ailetes en matiere synthetique
CA1187258A (fr) * 1982-12-02 1985-05-21 Lupke, Manfred A. A. Methode et dispositif de fabrication de tubes thermoplastiques a double paroi et emboitement
US4500284A (en) * 1983-09-16 1985-02-19 Lupke Manfred Arno Alfred Forming single wall bells in double wall pipe
FI75414C (fi) * 1985-07-29 1988-06-09 Uponor Nv Roerkoppling.
US4702502A (en) * 1985-08-06 1987-10-27 Contech Construction Products Inc. Gasket for making joints in corrugated plastic pipe
JPS63218333A (ja) * 1987-03-06 1988-09-12 Seiji Nagayoshi 合成樹脂管の製造装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8808784A1 *

Also Published As

Publication number Publication date
WO1988008784A1 (fr) 1988-11-17
EP0291136A1 (fr) 1988-11-17
DE3866277D1 (de) 1992-01-02
NL8701164A (nl) 1988-12-01
DK567289A (da) 1989-11-13
FI90129B (fi) 1993-09-15
ATE69578T1 (de) 1991-12-15
JP2631887B2 (ja) 1997-07-16
DK163320C (da) 1992-07-06
DK163320B (da) 1992-02-17
DK567289D0 (da) 1989-11-13
JPH09117950A (ja) 1997-05-06
FI895424A0 (fi) 1989-11-14
EP0291136B1 (fr) 1991-11-21
JPH02503407A (ja) 1990-10-18
EP0291136B2 (fr) 1995-12-06
CA1303518C (fr) 1992-06-16
FI90129C (fi) 1993-12-27

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