WO2004080693A1 - Tete de co-extrudeuse permettant de produire des tubes souples renforces, procede afferent et tubes ainsi obtenus - Google Patents

Tete de co-extrudeuse permettant de produire des tubes souples renforces, procede afferent et tubes ainsi obtenus Download PDF

Info

Publication number
WO2004080693A1
WO2004080693A1 PCT/EP2004/002443 EP2004002443W WO2004080693A1 WO 2004080693 A1 WO2004080693 A1 WO 2004080693A1 EP 2004002443 W EP2004002443 W EP 2004002443W WO 2004080693 A1 WO2004080693 A1 WO 2004080693A1
Authority
WO
WIPO (PCT)
Prior art keywords
pvc
head
component
annular channel
coextrusion
Prior art date
Application number
PCT/EP2004/002443
Other languages
English (en)
Inventor
Amelio Ardo
Original Assignee
Industrie Plastiche Lombarde S.P.A.
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
Priority claimed from ITMI20030475 external-priority patent/ITMI20030475A1/it
Priority claimed from ITMI20032538 external-priority patent/ITMI20032538A1/it
Priority claimed from ITMI20032540 external-priority patent/ITMI20032540A1/it
Priority claimed from ITMI20032539 external-priority patent/ITMI20032539A1/it
Application filed by Industrie Plastiche Lombarde S.P.A. filed Critical Industrie Plastiche Lombarde S.P.A.
Publication of WO2004080693A1 publication Critical patent/WO2004080693A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
    • F16L11/112—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements embedded in the wall
    • 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
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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
    • B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow 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
    • 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
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/581—Winding and joining, e.g. winding spirally helically using sheets or strips consisting principally of plastics material
    • B29C53/582—Winding and joining, e.g. winding spirally helically using sheets or strips consisting principally of plastics material comprising reinforcements, e.g. wires, threads
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/005—Hoses, i.e. flexible

Definitions

  • the present invention relates to a method and operating head for producing reinforced flexible tubes, and the flexible tubes obtained.
  • Each of the stated aspects conforms to the introduction to the respective independent claim.
  • the technology for producing tubes of thermoplastic material incorporating a helical core of a different material is well known and based on the coextrusion of two or more materials within a coextrusion head to obtain a web, followed by helically hot-winding the coextruded web on a rotating mandrel.
  • reinforced flexible tubes possessing a helical core of non-stabilized rigid PVC, a core cladding formed from materials chosen from the group consisting of polyamides, polyesters, polyurethanes, polyketones, polyethylene copolymers and nitrile rubber, and a tubular wall of PVC plasticized by plasticizing agents, two components (i.e. core and cladding) being totally immersed in this wall.
  • the purpose of- the cladding is to form a barrier, i.e. to prevent migration of the plasticizer towards the rigid material of the helical core which, if contaminated, becomes fragile.
  • the state of the art also describes a head for coextruding the three said components, to obtain, at the outlet of a die connected to the coextrusion head, a continuous web of required cross-section to be helically hot-wound on the rotating mandrel.
  • the known coextrusion head comprises (for the core material) a central conduit, at an intermediate point of which the coextrusion with the core cladding material takes place, with coextrusion of the third material taking place only at the outlet of the central conduit, to incorporate the previously coextruded product .
  • the known method comprises (relative to the coextrusion of the three layers) a first coextrusion with two of the materials representative of the core and of the relative cladding, and a final coextrusion in which the third material incorporates the previously coextruded two.
  • the method is completed by forming a web from the triple coextrudate by drawing to a predetermined cross-section and helically hot-winding this formed web with its turns in mutual contact on a rotating mandrel to obtain the required tube, which is then cooled.
  • a main object of the present invention is to provide an extrusion head specifically intended for obtaining inventive flexible tubes, which is compact, reliable and of simple construction.
  • a further but determining object of the present invention is to provide a reinforced flexible tube different from current flexible tubes and is distinguished by being able to use, for the flexible part other than the core, materials which are of lesser quality or more economical
  • a further object of the present invention is to provide a reinforced flexible tube which is structurally simple, easily produced and of low cost.
  • Another object of the present invention is to provide a method for producing flexible tubes of the invention which enables their economical and substantially continuous production while not involving substantial modifications to the known methods, but in fact integrates them.
  • Figure 2 is a longitudinal section through the head of
  • Figure 3 is a front section through a detail of the coextrusion head
  • Figure 4 is a view on the section line 4-4 of the detail of
  • Figure 5 is a view of the detail of Figure 3 from above;
  • Figure 6 is a schematic cross-section through the triple- layer extruded bead before being drawn
  • Figure 7 is a view of a longitudinal half-section through the spiral tube, formed by winding the triple layer extruded bead of Figure 6, in which the deformation of the turns can be seen due to the forces generated during the winding of the tube;
  • Figure 8 is a longitudinal section through the constituent coextrudate of the tube before its winding to form the tube but following the drawing process.
  • Figure 9 is a longitudinal section through two turns of the coextrudate, just deposited on the mandrel but not yet deformed.
  • a coextrusion head indicated overall by 1 for producing the coextrudate of Figure 6 and the tube of Figure 7.
  • It comprises a support part 2 in which three conduits indicated respectively by 3, 4 and 5 are provided to feed into the head a first, a second and respectively a third component to be extruded.
  • the three conduits are hydraulically connected to known feed units for the components .
  • a holed spacer 6 for supporting a nosepiece carrier 7 is fixed to the support part 2.
  • Three inlet holes 3a, 4a and 5a are provided in correspondence with the conduits of the support part 2.
  • the nosepiece carrier 7 is provided with a central passage hole 9 for a nosepiece 11 and with an aperture 4b in correspondence with the hole 4a.
  • the central hole 9 presents a step 10, which together with the dowel 8 enables said nosepiece 11 to be fixed to the nosepiece carrier 7.
  • the nosepiece 11 presents a central channel 3b in correspondence with the hole 3a of the nosepiece carrier 7, and carries a nozzle 12 fixed in known manner to the end of the nosepiece 11.
  • the head also comprises a hollow member 13 for housing a conveyor member 14 which is also axially hollow and is fixed to the hollow member 13 by a step and a second dowel 16, similar to the fixing between the nosepiece 11 and the nosepiece carrier 7.
  • the conveyor member 14, shown in greater detail in Figures 3-5 presents a central hole 17 with its axis A coinciding with that of the nosepiece 11 and hence of the nozzle 12, and an elbow conduit 18 communicating with a groove 19, the geometry of which is described hereinafter and which forms an important . part of the present invention.
  • the central hole 17 houses the nosepiece 11, between the outer surface of the nosepiece and the surface of the central hole 17 there being formed an annular conduit 20 communicating with the conduit 4 via a passage 21 which itself • communicates with the aperture 4b and through which the second component arrives to form the filler of the coextrudate of Figure 6.
  • the groove 19 is advantageously formed by spiral milling of the surface of the conveyor member 14, the cylindrical surface S downstream of this groove (to the left in Figure 4) being subsequently cylindrically milled in a manner eccentric to the axis A, and practically on a circumference C centered at Bl ( Figure 3) .
  • the base D of the groove 19, well evident in proximity to the elbow conduit 18, is in a position opposite the opening of the conduit 18, practically removed by said milling operation.
  • the conveyor member 14 When the conveyor member 14 is mounted, it forms with the cylindrical wall of the hollow member 13 a passage or conduit (22a, b) for the third component, said passage having its passage opening continuously widening radially in moving away from the elbow conduit 18 to obtain, as its final result, a uniform flow rate of the component in such a manner as to reduce the pressure drops and make uniform the pressure of the fluid fed into the gap (22a, b) between the cavity in the hollow member 13 and the outer surface of the conveyor member 14.
  • the passage gap 22a in the upper part of the figure, between the inner surface of the cavity in the hollow member 13 and the outer surface of the conveyor member 14, is very narrow, whereas the said gap in the lower part 22b is wider. This compensates the pressure drops which occur in feeding the fluid into the gap and, besides allowing it to be properly filled, it makes the flow rate of the fluid fed into it uniform.
  • the gap in question extends conically towards the central hole 17 and opens into it at the end of the annular conduit 20, i.e. before the opening of the nozzle- 12, with the result that the materials originating from the channel 20 meet the gap (22a, b) before they encounter the material leaving the nozzle 12.
  • a die block 25 gives the final shape to the coextruded bead, in this case it giving the bead the shape of Figure 9.
  • the components which are to form the spiral tube at the end of the process are injected respectively into the first conduit 3, the second conduit 4 and the third conduit 5.
  • a first component which at the end of the forming process will constitute the rigid part of the tube, i.e. the helical core (31, 300) .
  • This material can vary according to the final characteristics of the tube to be formed and will be discussed in detail hereinafter.
  • the rigid core is rigid PVC. If the rigid material were instead, for example, a metal, the conduit 3b would assume a different shape, but in any event conventional and tubular.
  • the second component (32, 200) is fed into- the second conduit 4 to constitute at the end of the forming process the preponderant elastic part of the spiral tube, it being substantially virgin plasticized PVC or regenerated plasticized PVC.
  • regenerated plasticized PVC is injected into the conduit 4.
  • the component to form the inner and outer cladding of the tube is fed under pressure into the third conduit 5, and gives the tube its special characteristics.
  • electroconductive PU, virgin PVC, polyurethane-PVC, nitrile-PVC, oil-repellent PVC, abrasion resistant PU or any other material able to give the final spiral tube a specific physical characteristic can be injected.
  • nitrile-PVC is injected into the third conduit 5, to give the tube a specific resistance to oily substances.
  • the material injected into the first conduit 3, in this case rigid PVC, is simply conveyed along the axis of the nosepiece 11, while the elastic material injected into the conduit 4, in this case plasticized regenerated PVC, wraps it only after being wrapped in its turn by the cladding material.
  • the cladding material fed. into the conduit 5 (for example nitrile-PVC) , traverses the curved conduit 18 and is distributed within the groove 19 and then, uniformly, within the section between the hollow member 13 and conveyor member 14 (i.e. within the gap 22a, b) . Distribution is particularly uniform by virtue of the fact that the discharge passage has an increasing cross-section as the distance from the insertion point increases. Because of this the pressure drop decreases as the distance from the curved conduit 18 increases. At the exit from the conical point of the gap 22a, b there is pinch region 26, the purpose of which is to uniformly increase the exit pressure, to ensure the total filling of the upstream sections.
  • pinch region 26 the purpose of which is to uniformly increase the exit pressure, to ensure the total filling of the upstream sections.
  • the regenerated PVC layer of the elastic filler part (32, 300) which moves within the conduit 20 encounters, in a region upstream of the outlet of the nozzle 12, the thin layer of cladding material (33, 600), "' ' to form • a first coextrudate, said first coextrudate encountering the exiting rigid PVC (31, 300) at the outlet of the nozzle 12 to form a triple coextrudate 30 ( Figure 6) .
  • the extrudate 30 is as indicated in Figure 6, hence substantially with a circular core 31 of rigid PVC, a first core cladding 32 of regenerated PVC, constituting the preponderant part, and a second thin nitrile-PVC cladding 33 constituting the characterising ' part of the tube.
  • the final bonding of the three components takes place within the conveyor/die assembly 23.
  • the extrudate 30 is then shaped by the die block 25 into the final shape, which in this case is that shown in Figure 8.
  • the bead of extrudate is then hot-wound on a rotating mandrel in accordance with the known art to form the tube, which is then cooled.
  • cladding 600 on the tube filler part 200 which is of higher quality (and hence more costly) PVC, and in particular virgin PVC.
  • the spiral tube 100 is formed, as shown in axial half- section in Figure 7.
  • a continuous strip of coextrudate becomes hot-deposited on the rotating mandrel.
  • the rotation of the mandrel causes, at each revolution, that spiral turn of the coextrudate which has just been deposited to come into lateral contact with that previously wound on the mandrel.
  • This contact of the lateral portions 900, 1000 (the sides of the spiral turns, Figure 9) and the fact that deposition takes place hot enables perfect bonding of the coextrudate to be achieved along the sides of the turns.
  • the inner wall 700 and the outer wall 800 of the tube are hence formed.
  • the adjacent sides of the turns 900, 1000 which come into contact and are hence bonded during deposition of the coextrudate pertain to the virgin PVC cladding; in this respect, this virgin PVC cladding completely wraps and isolates the filler part 200 of lesser quality, inexpensive and non-characterising material.
  • regenerated plastic PVC does not bond together properly.
  • a spiral tube such as that illustrated is particularly advantageous because there is only virgin PVC visible on the outside, and in contact with the liquid or fluid on the inside, even though most of the tube is of regenerated plastic PVC, with considerable advantage in terms of costs, economy and environmental impact.
  • the cladding 600 of the filler part 200 of the tube 100 is of enriched PVC, which gives the tube special resistance characteristics.
  • the tube is wear resistant and in particular abrasion resistant, hence the cladding 600 is a PVC-polyurethane mixture.
  • the preferred polyurethane percentage is around 40% by weight, but can vary from 3% to 90%.
  • the cladding can be of substantially pure polyurethane .
  • a spiral tube such as that illustrated in this example is particularly advantageous because there is only PVC-PU visible on the outside and in contact with the liquid or fluid on the inside, even though most of the tube is of regenerated plastic PVC, with considerable advantage in terms of costs, economy and environmental impact.
  • a further advantage is that the quality material cladding, in this case wear-resistant, is on both the inner surface and outer surface of the tube. This considerably improves the resistance characteristics of the tube compared with traditional tubes, and in particular with wear resistant tubes .
  • a part of the filler 200 is of virgin PVC, to make the wear resistant tube of enhanced quality but still more economical than one formed only of PVC-PU.
  • the cladding 600 is formed of nitrile-PVC. The nitrile percentage is about 20%, but can vary from 3 to 30%. The addition of nitrile enables the cladding to resist oils. It is evident that also in this embodiment the filler part 200. can be formed of regenerated plastic PVC or virgin plastic PVC according to requirements.
  • the cladding 600 is formed of PVC-PU, i.e. antistatic.
  • polyurethane enables the electroconductive inner wall to be in electrical transmission contact with the outer wall of the tube, also electroconductive, and hence discharge to earth any static electricity which may be generated inside the tube due to friction between the fluid flowing through it and its inner wall.
  • the filler part 200 can evidently be of regenerated plastic PVC or virgin PVC according to requirements .
  • the tube formed in this manner is particularly advantageous because it combines the flexibility deriving from its construction with perfect antistatic characteristics, and is hence very useful for transporting fluids with suspended particles or flammable liquids.
  • the thin cladding part 600 which gives the tube its special characteristics, can be formed of any material in addition to those listed, according to the particular characteristics to be given to the industrial tube.

Abstract

Cette invention a trait à une tête de co-extrudeuse à trois composants ainsi qu'au procédé correspondant, permettant de produire une bande dans laquelle les trois composants (200, 300, 800) sont disposés l'un derrière l'autre. A sa sortie de la tête de la co-extrudeuse, on enroule la bande sur un support rotatif afin de former un tube souple en spirale (100) se composant d'un noyau (300), d'un corps (200) renfermant le noyau et d'une gaine (800) enveloppant entièrement le corps. Il est possible d'utiliser ce tube pour le transport de fluides.
PCT/EP2004/002443 2003-03-12 2004-03-10 Tete de co-extrudeuse permettant de produire des tubes souples renforces, procede afferent et tubes ainsi obtenus WO2004080693A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
ITMI20030475 ITMI20030475A1 (it) 2003-03-12 2003-03-12 Tubo elettroconduttivo flessibile per il trasporto di fluidi
ITMI03A000475 2003-03-12
ITMI20032538 ITMI20032538A1 (it) 2003-12-19 2003-12-19 Testata di coestrusione a tre strati
ITMI20032540 ITMI20032540A1 (it) 2003-12-19 2003-12-19 Tubo spiralato per il trasporto di fluidi industriali
ITMI20032539 ITMI20032539A1 (it) 2003-12-19 2003-12-19 Tubo spiralato per il trasporto di acqua o fluidi in generale
ITMI03A002540 2003-12-19
ITMI03A002539 2003-12-19
ITMI03A002538 2003-12-19

Publications (1)

Publication Number Publication Date
WO2004080693A1 true WO2004080693A1 (fr) 2004-09-23

Family

ID=32996130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/002443 WO2004080693A1 (fr) 2003-03-12 2004-03-10 Tete de co-extrudeuse permettant de produire des tubes souples renforces, procede afferent et tubes ainsi obtenus

Country Status (1)

Country Link
WO (1) WO2004080693A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2123958A2 (fr) * 2008-05-23 2009-11-25 Merlett Tecnoplastic S.p.A. Tube de dissipation de charge électrostatique hautement résistant à l'usure
EP2345832A3 (fr) * 2010-01-19 2012-08-15 foxiflex GmbH & Co. KG Tuyau flexible et procédé de fabrication

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558754A (en) * 1968-02-27 1971-01-26 Eau & Feu Sa Process of manufacturing hose pipes
US3737490A (en) * 1969-12-09 1973-06-05 British Insulated Callenders Manufacture of insulated electric cables
US4871487A (en) * 1987-01-16 1989-10-03 The Dow Chemical Company Method of making a polymeric optical waveguide by coextrusion
CH675982A5 (en) * 1987-04-15 1990-11-30 Swiss Cab E A Schoen S A Extruder head to make profiles with superficial coloured stripes
EP0534208A1 (fr) * 1991-09-23 1993-03-31 Siemens Aktiengesellschaft Tête d'extrusion pour la co-extrusion d'au moins deux matériaux plastiques
WO2001004530A2 (fr) * 1999-07-08 2001-01-18 Fitt S.P.A. Tuyau souple renforce, procede et tete de pompage pour la production de celui-ci

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3558754A (en) * 1968-02-27 1971-01-26 Eau & Feu Sa Process of manufacturing hose pipes
US3737490A (en) * 1969-12-09 1973-06-05 British Insulated Callenders Manufacture of insulated electric cables
US4871487A (en) * 1987-01-16 1989-10-03 The Dow Chemical Company Method of making a polymeric optical waveguide by coextrusion
CH675982A5 (en) * 1987-04-15 1990-11-30 Swiss Cab E A Schoen S A Extruder head to make profiles with superficial coloured stripes
EP0534208A1 (fr) * 1991-09-23 1993-03-31 Siemens Aktiengesellschaft Tête d'extrusion pour la co-extrusion d'au moins deux matériaux plastiques
WO2001004530A2 (fr) * 1999-07-08 2001-01-18 Fitt S.P.A. Tuyau souple renforce, procede et tete de pompage pour la production de celui-ci

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2123958A2 (fr) * 2008-05-23 2009-11-25 Merlett Tecnoplastic S.p.A. Tube de dissipation de charge électrostatique hautement résistant à l'usure
EP2123958A3 (fr) * 2008-05-23 2010-09-22 Merlett Tecnoplastic S.p.A. Tube de dissipation de charge électrostatique hautement résistant à l'usure
EP2345832A3 (fr) * 2010-01-19 2012-08-15 foxiflex GmbH & Co. KG Tuyau flexible et procédé de fabrication

Similar Documents

Publication Publication Date Title
CN101553271B (zh) 微导管
JPH024300Y2 (fr)
FI82133B (fi) Spirallindat roer.
EP2842722B1 (fr) Tuyau composite métal/résine facilement enroulable en forme annulaire, et procédé de fabrication dudit tuyau
US4033808A (en) Apparatus for the production of hollow bodies, especially large-diameter ducts from thermoplastic synthetic resin
CA2066257C (fr) Tuyau souple et methode de fabrication
US10927981B2 (en) Pipe with an outer wrap
JPH09512445A (ja) 管体及びその製造方法
WO1995021051A1 (fr) Procede de production de tube ondule a couches multiples presentant des caracteristiques plastiques differentes
JPH071541A (ja) 回転するコードガイドを伴う同時押出し装置及び方法
AU8105687A (en) Apparatus for forming plastics coated tube
US20170336001A1 (en) Pipe with an outer wrap
US6615876B2 (en) Reinforced hose and associated method of manufacture
US5862591A (en) Method for manufacturing paint rollers
US20010008642A1 (en) Extruder die head
WO2004080693A1 (fr) Tete de co-extrudeuse permettant de produire des tubes souples renforces, procede afferent et tubes ainsi obtenus
EP1117958B1 (fr) Tuyau souple renforce, procede et tete de pompage pour la production de celui-ci
JP2000509132A (ja) プラスチックマテリアルの圧力チューブ
EP3233451A1 (fr) Procédé, ligne de fabrication et poste de travail pour la fabrication continue d'un tuyau souple renforcé, et tuyau ainsi fabriqué
EP1637787B1 (fr) Tuyau ondulé à enveloppe externe de protection
WO2001013022A1 (fr) Tuyau composite en plastique avec renforcement sous forme de treillis metallique et procede de fabrication dudit tuyau
CA1043717A (fr) Tuyau souple composite et arme
JP2001050435A (ja) 複合可とう管及びその製造方法
KR102441884B1 (ko) 3중구조 중공충진벽관
CN218429857U (zh) 内层共挤成型机头

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 69(1) EPC (EPO FORM 1205A) DATED 03.01.05

122 Ep: pct application non-entry in european phase