WO2006104454A1 - Method and arrangement for forming an inner lining within a section of a tube - Google Patents

Method and arrangement for forming an inner lining within a section of a tube Download PDF

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Publication number
WO2006104454A1
WO2006104454A1 PCT/SE2006/050036 SE2006050036W WO2006104454A1 WO 2006104454 A1 WO2006104454 A1 WO 2006104454A1 SE 2006050036 W SE2006050036 W SE 2006050036W WO 2006104454 A1 WO2006104454 A1 WO 2006104454A1
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WO
WIPO (PCT)
Prior art keywords
nozzle
plastic material
sub
chosen
units
Prior art date
Application number
PCT/SE2006/050036
Other languages
French (fr)
Inventor
Sten Edström
Original Assignee
Proline Ab
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 Proline Ab filed Critical Proline Ab
Priority to EP06717120A priority Critical patent/EP1866567A4/en
Publication of WO2006104454A1 publication Critical patent/WO2006104454A1/en
Priority to NO20072865A priority patent/NO20072865L/en

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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
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
    • F16L58/1027—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a sprayed layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member
    • B05B3/1021—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member with individual passages at its periphery

Definitions

  • the present invention relates generally to a method and to an arrangement wherewith a curable viscous plastic material can be slung onto the inner surface of a tube, or more particularly onto a section of a tube, with the aid of a rotating nozzle, wherewith the thus applied plastic material is cured via a curing process such as to create a lining or a lining-related layer of plastic material.
  • the rotatable nozzle is co-ordinated with a bearing unit which includes a bearing, and/or a motor unit, said units being structured for common axial movement through the tubular section.
  • This movement of said units will preferably take place with the aid of a device which centres the nozzle and/or the bearing unit and/or the motor unit within the tubular section, wherewith the nozzle is structured and formed so that it can function as a small magazine for part of the viscous plastic material fed by a pump, in a somewhat pulsating fashion, towards and up to the nozzle and its magazine wherewith consecutive parts of plastic material delivered to the nozzle are caused to rotate by said nozzle about a nozzle rotational axis in response to centrifugal forces active on the curable viscous plastic material so that said material will be slung from the nozzle.
  • viscous plastic material is meant primarily a curable plastic material that has a consistency corresponding to that of porridge.
  • pipe and tubular section is meant any tubular object onto which viscous plastic material is able to fasten and coat the inner surfaces of said object and thereafter harden or cure to form a durable lining.
  • pipes and tubular sections is meant all forms of liquid transporting conductors, such as tap water pipes and gas pipes, whose inner surfaces include a hardened or cured liquid tight or gas tight plastic lining.
  • the invention is particularly intended for providing building-installed corroded or otherwise defective drainage pipes made of plastic or metal, particularly iron.with a protective and reinforced lining.
  • coating is meant a collection of viscous and curable plastic material that has been slung by means of a rotating nozzle against an inner surface of a tubular section and has adhered to said inner surface.
  • lining is meant a cured or hardened coating on the inner surface of said tubular section or pipe.
  • a viscous plastic material in the form of plastic material sub-units is fed towards and to a nozzle that includes a cavity which forms initially a limited magazine for plastic material sub-units in the absence of rotary motion, these sub-units being caused to rotate rapidly in response to rotary movement of the nozzle, by the friction acting against the inner wall part of the nozzle.
  • plastic material sub-units shall be understood as meaning a sluggishly flowing, although running, plastic mass that shall be considered to consist of a number of mutually sequential fictive sub-units or fractions that are slung out by the nozzle.
  • a first plastic material sub-unit adjacent the inner surface of the nozzle will be imparted first rotational motion by frictional forces or vanes, this rotational motion of the sub- units subsequently accelerating.
  • first plastic material sub-units are imparted said first rotary movement
  • second plastic material sub-units will be imparted a second rotary motion as a result of the viscosity of and the internal friction created by said plastic material, although the second rotary motion will be slightly slower than the speed at which said first plastic material sub-units are rotated and the first rotary motion thereof.
  • the plastic material sub-units are caused to produce different "layers" at mutually different rotational velocities, with said velocities increasing towards the upper edge of the nozzle and decreasing towards a nozzle rotational centre.
  • each plastic material sub-unit, plastic particle and/or reinforcing particles will be influenced by centrifugal forces during rotation.
  • the plastic material sub-units will be forced outwards and those plastic material sub-units located within the magazine will be pressed out towards the inner surface of the nozzle and in the presence of slots in the nozzle will be pressed through the slots and therewith form "jets" which have the shape of said slots and which exit from the nozzle at right angles or at least generally at right angles and therewith rotate at a rotational speed or a peripheral speed corresponding to the rotational speed or peripheral speed of the outer-periphery forming edge of the nozzle.
  • the resultant "hollow cylindrically configured" spread of mutually sequential collections of plastic material sub-units is allocated a high radial velocity and a low material concentration, with the plastic material sub-units being spread in a helical or spiral configuration.
  • the plastic material sub-units are delivered to a nozzle cavity in a surplus quantity in relation to the outfeed that takes place via particle jets through said slots, this surplus material being forced outwards and over an upper edge of the nozzle via the slots.
  • the resultant "hollow cylindrically configured" upper and initial spread of plastic material sub-units is allocated a lower radial rotational speed and a higher material concentration.
  • the described and illustrated form of a nozzle used in this known arrangement includes narrow and small axially orientated slots (20), described more specifically in, inter alia, column 2, lines 53 to 67, through which collected viscous and curable plastic material in the nozzle shall exit and therewith be slung out at a small material density against the inner wall of the pipe or tubular section in the form of "jets", that have a hollow cylindrical distribution.
  • US-A-3 279 427 are also relevant with respect to the earlier standpoint of techniques, this publication illustrating and describing an arrangement for providing a concrete pipe with an internal lining with the use of a plastic material mixed with sand.
  • Patent publication EP-A2-0 781 606 illustrates and describes an arrangement for lining/coating the interior surface of a pipe (1).
  • the arrangement includes a rotatable nozzle (10), which is displaced along the inside of the pipe (1), and also includes means (12) for feeding a stream of viscous plastic material towards the nozzle (10), whereby the plastic material is slung out from the nozzle perimeter or an upper edge of the nozzle (10) onto the inner wall of the pipe (1) under the influence of centrifugal forces, whereafter the thus created viscous coating is allowed to harden.
  • Patent publication US-A-3 459 586 illustrates and describes a method and an arrangement for applying an internal coating to the internal surface of a pipe with the aid of a plurality of tooth-like projections.
  • Patent publication DE-A1-198 05 027 illustrates and describes an arrangement for distributing a viscous material along the inner surface of a hollow body with the aid of a rotated nozzle that includes openings (8).
  • Patent publication GB-A-2 218 773 illustrates and describes an arrangement with which there is first applied to the inner surface of a tubular section an insulating coating (2), such as a coating of polyurethane foam, whereafter said surface is coated with a mechanically and thermally stable material (3), such as epoxy resin.
  • insulating coating (2) such as a coating of polyurethane foam
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the curable viscous coating to be formed initially from a distribution of plastic material of high density and thereafter utilizing a distribution of plastic material of a lower material density, as described according to the known technology according to Patent publication US-A-5 951 761.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in applying the coating of curable viscous material to an initial thickness from an upper hollow-cylindrical spreading and distribution of said material, where said spreading of the material shall be effected with the aid of different velocity vectors so as to form a somewhat turbulent flow within the hollow cylindrical material structure.
  • a technical problem also resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required to provide a method and an arrangement with which a curable viscous plastic material is slung by a rotating nozzle onto the inner surface of a tubular section such as to form, when hardened or cured, a lining-forming wear resistant, liquid tight and/or gas tight plastic material layer, and in co-ordinating the rotatable nozzle with a bearing unit and/or a motor unit structured for, axial displacement through said tubular section, and in arranging said displacement to be achieved with the aid of a device which centres the nozzle and/or the bearing unit and/or the motor unit in said tubular section, and in adapting the nozzle so that it can function as a magazine for part of the plastic material fed to said nozzle and preferably to its central part, and in causing the nozzle to be rotated so that centrifugal forces acting on individual parts of the curable plastic material and an admixed rein
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the curable viscous plastic material slung from the nozzle to be structured as upper and lower hollow cylindrical layers or hollow cylindrical collections prior to the plastic material striking the internal surface of the tubular section and adhering to said interior surface in the form of a structured coating consisting of one or more layers.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing an upper hollow cylindrical layer or collection of the plastic material slung onto the internal surface of the tubular section to be given a rotational velocity around the rotational axis of the nozzle that lies beneath a chosen peripheral speed of the nozzle.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing at least one underlying hollow cylindrical layer or collection to be given a somewhat higher rotational speed than the upper layer of plastic material slung out towards the internal surface of the tubular section.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in causing intermediate and/or co-ordinated layers to be achieved within said upper hollow cylindrical layer or collection of the plastic material slung out towards the inner surface of the tubular section, at mutually different rotational speeds related to the rotational speed of the nozzle.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing an underlying hollow cylindrical layer or collection to be given a rotational velocity which conforms to the rotational velocity and peripheral velocity of the nozzle in a known manner, although with a chosen material density that is considerably lower than the chosen material density of the upper hollow cylindrical layer or collection.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing a thickness for the curable, viscous plastic material of high material density structured as a hollow cylindrical layer or collection to be dependent on a chosen viscosity and structure of said plastic material.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the chosen thickness of the upper hollow cylindrical layer to at least exceed 1.0 mm.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said thickness to be chosen so as to be smaller than a chosen depth of a basin-shaped, cup-shaped or dish-shaped nozzle.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said layer thickness to be less than 5.0 mm.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing a nozzle centring device to have a diameter related to the internal diameter of the pipe or tubular section and, in respect of a straight tubular extension, centring the nozzle within an area which at least corresponds to ⁇ 25% of the internal diameter of the pipe or tubular section, such as ⁇ 20%.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said centring device to be given an elasticity or resilience that enables it to centre the nozzle in a straight tubular extension at least within a range of ⁇ 25% of the internal diameter of the tubular section or pipe.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the centring device to be placed adjacent to and slightly over the nozzle, and at least over the upper hollow cylindrical layer or collection.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the centring device to be displaceable relative to the bearing unit and/or relative to the motor unit and secured in a chosen set position.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the extent to which the device can be displaced to be less than 20 mm.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing an epoxy resin material containing reinforcement material, such as glass flakes, to be used as a curable viscous plastic material.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing a further underlying hollow cylindrical layer or collection to be formed via a few axially orientated or at least essentially axially orientated slots located in a nozzle that has a hollow cylindrical wall-part coordinated with a bottom part.
  • Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said underlying hollow cylindrical layer or collection to be formed via a few axially orientated or at least generally axially orientated narrow slots in a thin hollow cylindrical wall-part of the nozzle.
  • Another technical problem resides in realizing the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the width of said slots to be smaller than 300% and greater than 150% of the chosen maximum particle size, including the reinforcement material used.
  • the present invention takes as its starting point the above known techniques regarding a method and an arrangement for slinging a curable viscous plastic material onto the inner surface of a tubular section with the aid of a rotating nozzle such as to form a coating on the inner surface of the tubular section and allowing said coating to undergo a curing process and therewith create a wear resistant lining-forming layer of plastic material, wherewith the rotatable nozzle is co-ordinated with a bearing unit and/or a motor unit adapted for common axial movement through said tubular section, and wherein said axial movement can and should take place with the aid of a device that functions to centre the nozzle and/or the bearing unit and/or the motor unit within the pipe or tubular section, and wherein the nozzle is structured to function as a magazine for part of the viscous plastic material delivered to the nozzle and imparted rotational motion, wherein the nozzle is caused to rotate such that centrifugal forces acting on the individual particles of the curable viscous plastic material and on the reinforc
  • the curable plastic material slung out from the arrangement shall be structured as different layers, an upper layer or uppermost layer that has a rotational speed around the rotational axis of the nozzle that is below the chosen rotational speed of the nozzle, and at least one underlying hollow cylindrical layer or collection that rotates at a higher speed than said upper layer or collection.
  • intermediate sub-layers are caused to form between said upper layer and said underlying layer, wherein these intermediate sub-layers are caused to rotate at somewhat different speeds relative to the speed at which the nozzle rotates.
  • an underlying hollow cylindrical layer shall be caused to rotate at a speed that conforms to the speed at which the nozzle rotates, although with a material density that is considerably less than the material density chosen in respect of one or more overlying layers or collections.
  • the thickness of the curable viscous plastic material structured as a hollow cylindrical upper layer or collection is chosen in accordance with a chosen plastic material viscosity and structure.
  • viscosity corresponding to a "porridge-like consistency” said viscosity will preferably exceed 1.0 mm, although it will preferably be less than a chosen depth of a basin-like or dish-like nozzle.
  • Said thickness will preferably be less than 5.0 mm in normal cases.
  • the centring device will conveniently have a diameter related to the internal diameter of the pipe or tubular section and therewith provide a centring facility within a range of ⁇ 25% of the interior diameter of the pipe with respect to a straight tubular section or a straight pipe extension.
  • the centring device has an elasticity or resilience that provides a centring facility within an area of ⁇ 25% of the internal diameter of the pipe or tubular section in respect of a straight tubular section or a straight pipe section.
  • the centring device is placed adjacent to and slightly above the nozzle and its allotted upper hollow cylindrical layer.
  • the centring device can be displaced relative to and secured in a chosen setting position relative to the bearing unit and/or the motor unit.
  • the curable viscous plastic material used is an epoxy resin material that incorporates a reinforcing material, such as glass flakes.
  • the underlying hollow cylindrical layer or collection is formed through the agency of axially orientated slots, or at least generally axially orientated slots, provided in a hollow cylindrical wall-portion of the nozzle.
  • the underlying layer or collection is formed via a few axially or at least generally axially orientated narrow slots provided in a hollow cylindrical thin wall- part of the nozzle.
  • the slots will have a width which is smaller than 300% and greater than 150% of the maximum width measurement and/or length measurement of the incorporated reinforcing material.
  • a particular advantage afforded by the invention is that a thick coating can be applied initially to the interior surface of the pipe or tubular section in one or more stages with the aid of a hollow cylindrical layer or collection slung from the nozzle with a high material density and at an adapted speed or velocity, and thereafter build on the thus applied thick layer with the aid of one or more underlying hollow cylindrical layers or collections of low material density slung from the nozzle at a speed which corresponds directly to the speed at which the nozzle rotates.
  • Figure 1 illustrates a known arrangement according to Figure 2 of the US Patent publication US-A-5 951 761;
  • Figure 2 is an enlarged partial view of a rotatable nozzle included in the arrangement shown in Figure 1 , although the drawing has been supplemented to clarify conditions and requirements associated with the known technology in this case;
  • Figure 3 is a further enlarged partial view of the nozzle shown in Figure 2 to which sub-units of a viscous plastic material are delivered in an extent corresponding to the properties and requisites associated with the present invention.
  • Figure 4 is intended to illustrate schematically a successive build-up of the viscous plastic material to form a coating on the inner surface of the tubular section with the aid of a nozzle which is filled with viscous plastic material to a level above its width; see Figure 3.
  • Figures 1 and 2 illustrate a known arrangement for slinging a curable and viscous plastic material against the inner surface (24) of a pipe (22) with the aid of a rotatable nozzle (7) and therewith apply to said surface a lining-forming wear resistant layer (24') of plastic material via a curing process, wherewith said rotatable nozzle (7) is co-ordinated with a bearing unit (19), wherein the nozzle and the bearing unit are adapted for common axial displacement through the pipe (22).
  • the nozzle (7) is structured to function as a magazine (16) for part of the viscous plastic material and its sub-units fed to the nozzle and imparted rotary motion by the nozzle (7) so that the curable viscous plastic material will be slung from the nozzle (7) onto the internal surface (24) of the pipe (22) through the agency of centrifugal forces that act on the curable viscous plastic material, wherewith the sub-units are slung from the nozzle at a rotational speed corresponding to the speed at which the nozzle rotates.
  • the material sub-units thrown out by the nozzle are given a speed and a direction relating to a velocity component that is dependent on said rotational motion and to a velocity-related component that is dependent on centrifugal forces, wherewith the plastic material sub-units thrown from the nozzle form or are co-ordinated within a hollow cylindrical layer or a collection of low material density and therewith given a helical structure.
  • the plastic material sub-units co-ordinated in the magazine have been identified with the reference sign E3 and form an upper delimiting surface E3a, which has been greatly generalized or stylized for the sake of simplification.
  • FIGS 3 and 4 of the accompanying drawings thus illustrate schematically and in detail the basic requisites of the present invention where the significant properties of the present invention have been concretised in the form of the embodiment at present preferred and described more specifically in the following text.
  • Figures 3 and 4 show that a significant percentage (at least over 80%) of the plastic material E2 slung out by the arrangement shall pass over an upper surface and/or upper edge 7a of the nozzle 7.
  • This edge may include teeth or like projections (not shown) for imparting to underlying material sub-units (such as E5) a speed corresponding to the rotational speed and peripheral speed of the nozzle 7.
  • the plastic material layer E2 for the upper curable plastic material slung from the nozzle will be structured as a sub-layer, an upper or uppermost layer E4 that rotates about the rotational axis of the nozzle at a speed lower than the speed at which the nozzle rotates, and an underlying an underlying sub-layer E5 which rotates at a slightly higher speed than the upper layer.
  • the different rotational speeds and the mutually disparate centrifugal forces between said upper sub-layer E4 and said lower sub-layer E5 means that these sub-layers are orientated intermediately of the sub-layer E6 with mutually different rotational speeds relative to the rotational speed of the nozzle.
  • the lowermost hollow cylindrical layer E2' shall be given a rotational speed that conforms with the rotational speed of the nozzle 7, although with a material density that is significantly lower than the material density chosen for the layer E2.
  • the thickness "t" of the layer E2, with structured curable viscous plastic sub-units is chosen in accordance with the chosen viscosity and structure of the plastic material sub-units E1 , where said thickness is chosen to exceed 1.0 mm.
  • the directives given in accordance with the present invention enable the thickness "t" to correspond to a chosen distance between an upper edge 7a of the nozzle and the lower surface 19a of the bearing unit 19.
  • the thickness "t" is chosen to be smaller than a chosen depth "d" of the dish-shaped or basin-shaped nozzle 7.
  • the thick ness "t" will normally be less than 5.0 mm.
  • the outer diameter of the centring device 23 in relation to the internal diameter of the pipe or tubular section is chosen so as to provide in a straight tubular extension a centring effect within a range corresponding to ⁇ 25% of the internal diameter of the pipe.
  • the centring device 23 has an elasticity or resilience that provides a centring effect within the range of ⁇ 25% of the internal diameter of the pipe in a straight pipe extension.
  • the centring device 23 is positioned adjacent to and slightly over the upper layer E2.
  • the centring device 23 can be displaced relative to and secured in a chosen setting position relative to the bearing unit 19 and/or the motor unit and includes a circular recess 23a to this end.
  • the extent of the illustrated displacement will preferably be less than 20 mm.
  • An epoxy resin material admixed with reinforcing material, such as glass flakes, is used as said curable plastic material sub-units (E1).
  • the underlying layer E2' is formed via axially orientated or at least generally axially orientated slots 20 disposed in a hollow cylindrical wall-portion 7b of the nozzle 7.
  • the chosen width of the slots is smaller than 300% and greater than 150% of the chosen maximum length measurement or width measurement of the reinforcing material included in the curable plastic material.
  • the invention is based on the ability to quickly apply a thick coating 10a on the interior surface 22a of the pipe or tubular section with the aid of a first layer E2 and also with the aid of different sub-layers E4, E6, E5, and with the aid of plastic material sub-units that are slung from the arrangement with a high material density and a high rotational speed which, however, is slightly reduced relative to the speed at which the nozzle rotates, and therewith apply a thin coating 10b on the thick coating 10a when different coating techniques are employed with respect to thickness, material density and rotational speeds.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulding By Coating Moulds (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A method of slinging sub-units of a curable viscous plastic material against the inner surface (22a) of a tubular section (22) with the aid of a rotatable nozzle (7) such as to form, via a curing process, a lining-forming coating (10) of plastic material, wherein the rotatable nozzle (7) is co-ordinated with a bearing unit and/or a motor unit adapted for common axial displacement through said tubular section, wherein said nozzle (7) is structured to function as a magazine (16) for part (E3) of the plastic material (E1) which is fed towards and into the magazine (16) of said nozzle and which are caused to rotate by the nozzle (7) such that the sub-units of the curable viscous plastic material will be slung from the nozzle (7) by its rotational movement and by centrifugal forces acting on said sub-units. The sub- units (E2)of plastic material slung from the nozzle shall pass partially and in a surplus quantity over a surface and/or an edge (7a) of the nozzle (7), wherein the sub-units of the curable plastic material shall be structured as layers or collections, an upper layer (E2) which rotates around the rotational axis of the nozzle (7) at a speed which is lower than the speed at which the nozzle rotates, and at least one underlying layer (E2') that rotates at a higher speed than said upper layer (E2). It is proposed that Figure 3 is published together with the abstract.

Description

METHOD AND ARRANGEMENT FOR FORMING AN INNER LINING WITHIN A SECTION OF A TUBE
The present invention relates generally to a method and to an arrangement wherewith a curable viscous plastic material can be slung onto the inner surface of a tube, or more particularly onto a section of a tube, with the aid of a rotating nozzle, wherewith the thus applied plastic material is cured via a curing process such as to create a lining or a lining-related layer of plastic material.
The rotatable nozzle is co-ordinated with a bearing unit which includes a bearing, and/or a motor unit, said units being structured for common axial movement through the tubular section.
This movement of said units will preferably take place with the aid of a device which centres the nozzle and/or the bearing unit and/or the motor unit within the tubular section, wherewith the nozzle is structured and formed so that it can function as a small magazine for part of the viscous plastic material fed by a pump, in a somewhat pulsating fashion, towards and up to the nozzle and its magazine wherewith consecutive parts of plastic material delivered to the nozzle are caused to rotate by said nozzle about a nozzle rotational axis in response to centrifugal forces active on the curable viscous plastic material so that said material will be slung from the nozzle.
It can be mentioned in this context that by "viscous plastic material" is meant primarily a curable plastic material that has a consistency corresponding to that of porridge.
By "pipe" and "tubular section" is meant any tubular object onto which viscous plastic material is able to fasten and coat the inner surfaces of said object and thereafter harden or cure to form a durable lining. By pipes and tubular sections is meant all forms of liquid transporting conductors, such as tap water pipes and gas pipes, whose inner surfaces include a hardened or cured liquid tight or gas tight plastic lining. The invention is particularly intended for providing building-installed corroded or otherwise defective drainage pipes made of plastic or metal, particularly iron.with a protective and reinforced lining. By "coating" is meant a collection of viscous and curable plastic material that has been slung by means of a rotating nozzle against an inner surface of a tubular section and has adhered to said inner surface.
By "lining" is meant a cured or hardened coating on the inner surface of said tubular section or pipe.
It will also preferably be taken into account that a viscous plastic material in the form of plastic material sub-units is fed towards and to a nozzle that includes a cavity which forms initially a limited magazine for plastic material sub-units in the absence of rotary motion, these sub-units being caused to rotate rapidly in response to rotary movement of the nozzle, by the friction acting against the inner wall part of the nozzle.
The expression "plastic material sub-units" shall be understood as meaning a sluggishly flowing, although running, plastic mass that shall be considered to consist of a number of mutually sequential fictive sub-units or fractions that are slung out by the nozzle.
As these plastic material sub-units meet the rotatable nozzle, a first plastic material sub-unit adjacent the inner surface of the nozzle will be imparted first rotational motion by frictional forces or vanes, this rotational motion of the sub- units subsequently accelerating. When these first plastic material sub-units are imparted said first rotary movement, adjacent or subsequent second plastic material sub-units will be imparted a second rotary motion as a result of the viscosity of and the internal friction created by said plastic material, although the second rotary motion will be slightly slower than the speed at which said first plastic material sub-units are rotated and the first rotary motion thereof.
The plastic material sub-units are caused to produce different "layers" at mutually different rotational velocities, with said velocities increasing towards the upper edge of the nozzle and decreasing towards a nozzle rotational centre.
It will be understood that these "layers" are not clearly discernable in practical applications. However, such layers are truly obtained and the present invention is based on utilizing such layers.
It will be understood that each plastic material sub-unit, plastic particle and/or reinforcing particles will be influenced by centrifugal forces during rotation. In this regard, the plastic material sub-units will be forced outwards and those plastic material sub-units located within the magazine will be pressed out towards the inner surface of the nozzle and in the presence of slots in the nozzle will be pressed through the slots and therewith form "jets" which have the shape of said slots and which exit from the nozzle at right angles or at least generally at right angles and therewith rotate at a rotational speed or a peripheral speed corresponding to the rotational speed or peripheral speed of the outer-periphery forming edge of the nozzle.
The resultant "hollow cylindrically configured" spread of mutually sequential collections of plastic material sub-units is allocated a high radial velocity and a low material concentration, with the plastic material sub-units being spread in a helical or spiral configuration.
It is also proposed in accordance with the invention that the plastic material sub-units are delivered to a nozzle cavity in a surplus quantity in relation to the outfeed that takes place via particle jets through said slots, this surplus material being forced outwards and over an upper edge of the nozzle via the slots.
The resultant "hollow cylindrically configured" upper and initial spread of plastic material sub-units is allocated a lower radial rotational speed and a higher material concentration.
Background of the invention
Several different embodiments of methods, arrangements and constructions related to the technical field mentioned above are known to the art.
By way of a first example of the earlier standpoint of techniques and the technical field to which the present invention relates mention can be made to the arrangement described and illustrated in Patent publication US-A-5 951 761.
This arrangement and its modus operand/ will be described in more detail hereinafter with reference to the accompanying Figures 1 and 2.
The described and illustrated form of a nozzle used in this known arrangement includes narrow and small axially orientated slots (20), described more specifically in, inter alia, column 2, lines 53 to 67, through which collected viscous and curable plastic material in the nozzle shall exit and therewith be slung out at a small material density against the inner wall of the pipe or tubular section in the form of "jets", that have a hollow cylindrical distribution. The teachings of prior publication US-A-3 279 427 are also relevant with respect to the earlier standpoint of techniques, this publication illustrating and describing an arrangement for providing a concrete pipe with an internal lining with the use of a plastic material mixed with sand. Patent publication EP-A2-0 781 606 illustrates and describes an arrangement for lining/coating the interior surface of a pipe (1).
The arrangement includes a rotatable nozzle (10), which is displaced along the inside of the pipe (1), and also includes means (12) for feeding a stream of viscous plastic material towards the nozzle (10), whereby the plastic material is slung out from the nozzle perimeter or an upper edge of the nozzle (10) onto the inner wall of the pipe (1) under the influence of centrifugal forces, whereafter the thus created viscous coating is allowed to harden.
The Patent publication US-A-3 459 586 illustrates and describes a method and an arrangement for applying an internal coating to the internal surface of a pipe with the aid of a plurality of tooth-like projections.
Patent publication DE-A1-198 05 027 illustrates and describes an arrangement for distributing a viscous material along the inner surface of a hollow body with the aid of a rotated nozzle that includes openings (8).
Patent publication GB-A-2 218 773 illustrates and describes an arrangement with which there is first applied to the inner surface of a tubular section an insulating coating (2), such as a coating of polyurethane foam, whereafter said surface is coated with a mechanically and thermally stable material (3), such as epoxy resin.
The special features associated with the present invention are strongly related to the technical deliberations that are expressed in the International Patent Application PCT/SE2004/001692.
Summary of the present invention Technical problems
When taking into consideration the technical deliberations that a person skilled in this particular art must make in order to provide a solution to one or more technical problems that he/she encounters, it will be seen that it is necessary initially to realize the measures and/or the sequence of measures that must be undertaken to this end on the one hand, and to realize which means is/are required in solving one or more of said problems on the other hand. On this basis it will be evident that the technical problems listed below are highly relevant to the development of the present invention.
When considering the early standpoints of techniques as described above, it will be seen that a technical problem resides in the ability to realize the significance of, the advantages associated with and/or the technical measures and deliberations that will be required in enabling viscous plastic material sub-units slung from the nozzle to adhere to a tattered, worn or corroded internal surface of a tubular section in the form of a viscous layer or coating through the agency of different rotational velocities and with the aid of centrifugal forces acting on the plastic material sub-units slung from the nozzle, and there allowed to harden to form a water tight and/or gas tight lining. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the curable viscous coating to be formed initially from a distribution of plastic material of high density and thereafter utilizing a distribution of plastic material of a lower material density, as described according to the known technology according to Patent publication US-A-5 951 761.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in applying the coating of curable viscous material to an initial thickness from an upper hollow-cylindrical spreading and distribution of said material, where said spreading of the material shall be effected with the aid of different velocity vectors so as to form a somewhat turbulent flow within the hollow cylindrical material structure.
A technical problem also resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required to provide a method and an arrangement with which a curable viscous plastic material is slung by a rotating nozzle onto the inner surface of a tubular section such as to form, when hardened or cured, a lining-forming wear resistant, liquid tight and/or gas tight plastic material layer, and in co-ordinating the rotatable nozzle with a bearing unit and/or a motor unit structured for, axial displacement through said tubular section, and in arranging said displacement to be achieved with the aid of a device which centres the nozzle and/or the bearing unit and/or the motor unit in said tubular section, and in adapting the nozzle so that it can function as a magazine for part of the plastic material fed to said nozzle and preferably to its central part, and in causing the nozzle to be rotated so that centrifugal forces acting on individual parts of the curable plastic material and an admixed reinforcing material will be slung from the nozzle, and in causing the plastic material slung from said nozzle, although in a significant surplus, to pass over an upper surface and/or edge of the nozzle. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the curable viscous plastic material slung from the nozzle to be structured as upper and lower hollow cylindrical layers or hollow cylindrical collections prior to the plastic material striking the internal surface of the tubular section and adhering to said interior surface in the form of a structured coating consisting of one or more layers.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing an upper hollow cylindrical layer or collection of the plastic material slung onto the internal surface of the tubular section to be given a rotational velocity around the rotational axis of the nozzle that lies beneath a chosen peripheral speed of the nozzle.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing at least one underlying hollow cylindrical layer or collection to be given a somewhat higher rotational speed than the upper layer of plastic material slung out towards the internal surface of the tubular section.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in causing intermediate and/or co-ordinated layers to be achieved within said upper hollow cylindrical layer or collection of the plastic material slung out towards the inner surface of the tubular section, at mutually different rotational speeds related to the rotational speed of the nozzle. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing an underlying hollow cylindrical layer or collection to be given a rotational velocity which conforms to the rotational velocity and peripheral velocity of the nozzle in a known manner, although with a chosen material density that is considerably lower than the chosen material density of the upper hollow cylindrical layer or collection.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing a thickness for the curable, viscous plastic material of high material density structured as a hollow cylindrical layer or collection to be dependent on a chosen viscosity and structure of said plastic material.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the chosen thickness of the upper hollow cylindrical layer to at least exceed 1.0 mm.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said thickness to be chosen so as to be smaller than a chosen depth of a basin-shaped, cup-shaped or dish-shaped nozzle.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said layer thickness to be less than 5.0 mm.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing a nozzle centring device to have a diameter related to the internal diameter of the pipe or tubular section and, in respect of a straight tubular extension, centring the nozzle within an area which at least corresponds to ± 25% of the internal diameter of the pipe or tubular section, such as ± 20%. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said centring device to be given an elasticity or resilience that enables it to centre the nozzle in a straight tubular extension at least within a range of ± 25% of the internal diameter of the tubular section or pipe. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the centring device to be placed adjacent to and slightly over the nozzle, and at least over the upper hollow cylindrical layer or collection.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the centring device to be displaceable relative to the bearing unit and/or relative to the motor unit and secured in a chosen set position.
Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the extent to which the device can be displaced to be less than 20 mm. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing an epoxy resin material containing reinforcement material, such as glass flakes, to be used as a curable viscous plastic material. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing a further underlying hollow cylindrical layer or collection to be formed via a few axially orientated or at least essentially axially orientated slots located in a nozzle that has a hollow cylindrical wall-part coordinated with a bottom part. Another technical problem resides in the ability to realize the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing said underlying hollow cylindrical layer or collection to be formed via a few axially orientated or at least generally axially orientated narrow slots in a thin hollow cylindrical wall-part of the nozzle. Another technical problem resides in realizing the significance of, the advantages afforded by and/or the technical measures and deliberations that will be required in allowing the width of said slots to be smaller than 300% and greater than 150% of the chosen maximum particle size, including the reinforcement material used. Solution
The present invention takes as its starting point the above known techniques regarding a method and an arrangement for slinging a curable viscous plastic material onto the inner surface of a tubular section with the aid of a rotating nozzle such as to form a coating on the inner surface of the tubular section and allowing said coating to undergo a curing process and therewith create a wear resistant lining-forming layer of plastic material, wherewith the rotatable nozzle is co-ordinated with a bearing unit and/or a motor unit adapted for common axial movement through said tubular section, and wherein said axial movement can and should take place with the aid of a device that functions to centre the nozzle and/or the bearing unit and/or the motor unit within the pipe or tubular section, and wherein the nozzle is structured to function as a magazine for part of the viscous plastic material delivered to the nozzle and imparted rotational motion, wherein the nozzle is caused to rotate such that centrifugal forces acting on the individual particles of the curable viscous plastic material and on the reinforcing particles mixed therein will be slung from the nozzle towards and onto the internal surface of the tubular section.
With the intention of solving one or more of the above technical problems it is proposed in accordance with the present invention to supplement in particular the known technology with the feature of causing the viscous plastic material slung out from the arrangement to pass partially and in a high degree of surplus over an upper surface and/or edge of the nozzle, wherewith the curable plastic material slung from the arrangement shall be structured as different layers, an upper layer or uppermost layer that has a rotational speed around the rotational axis of the nozzle that is below the chosen rotational speed of the nozzle, and at least one underlying hollow cylindrical layer or collection that rotates at a higher speed than said upper layer or collection.
By way of proposed embodiments that lie within the scope of the basic concept of the present invention it is also proposed that intermediate sub-layers are caused to form between said upper layer and said underlying layer, wherein these intermediate sub-layers are caused to rotate at somewhat different speeds relative to the speed at which the nozzle rotates. According to known technology, an underlying hollow cylindrical layer shall be caused to rotate at a speed that conforms to the speed at which the nozzle rotates, although with a material density that is considerably less than the material density chosen in respect of one or more overlying layers or collections. The thickness of the curable viscous plastic material structured as a hollow cylindrical upper layer or collection is chosen in accordance with a chosen plastic material viscosity and structure.
With regard to a viscosity corresponding to a "porridge-like consistency" said viscosity will preferably exceed 1.0 mm, although it will preferably be less than a chosen depth of a basin-like or dish-like nozzle.
Said thickness will preferably be less than 5.0 mm in normal cases.
The centring device will conveniently have a diameter related to the internal diameter of the pipe or tubular section and therewith provide a centring facility within a range of ± 25% of the interior diameter of the pipe with respect to a straight tubular section or a straight pipe extension.
The centring device has an elasticity or resilience that provides a centring facility within an area of ± 25% of the internal diameter of the pipe or tubular section in respect of a straight tubular section or a straight pipe section.
The centring device is placed adjacent to and slightly above the nozzle and its allotted upper hollow cylindrical layer.
The centring device can be displaced relative to and secured in a chosen setting position relative to the bearing unit and/or the motor unit.
It is proposed in accordance with the invention that the extent of this displacement shall be less than 20 mm. The curable viscous plastic material used is an epoxy resin material that incorporates a reinforcing material, such as glass flakes.
The underlying hollow cylindrical layer or collection is formed through the agency of axially orientated slots, or at least generally axially orientated slots, provided in a hollow cylindrical wall-portion of the nozzle. The underlying layer or collection is formed via a few axially or at least generally axially orientated narrow slots provided in a hollow cylindrical thin wall- part of the nozzle. The slots will have a width which is smaller than 300% and greater than 150% of the maximum width measurement and/or length measurement of the incorporated reinforcing material.
Advantages
Those advantages that can be considered primarily characteristic of the present invention and the particularly significant characteristic features thereof reside in the creation of conditions that allow sub-units of a viscous plastic material slung from a rotating nozzle to be co-ordinated in hollow cylindrical layers or material collections that have mutually different rotational velocities and mutually different material densities, and which allow viscous plastic material to be applied to the inner surface of a tubular section in a number of application stages such as to form a viscous coating on said internal surface, and thereafter allowing the applied material to harden and therewith form a wear resistant, water tight and/or gas tight lining.
A particular advantage afforded by the invention is that a thick coating can be applied initially to the interior surface of the pipe or tubular section in one or more stages with the aid of a hollow cylindrical layer or collection slung from the nozzle with a high material density and at an adapted speed or velocity, and thereafter build on the thus applied thick layer with the aid of one or more underlying hollow cylindrical layers or collections of low material density slung from the nozzle at a speed which corresponds directly to the speed at which the nozzle rotates.
The primary characteristic features of the present invention are set forth in the characterising clause of the accompanying claim 1 while the primary characteristic features of an inventive arrangement are set forth in the characterising clause of the accompanying claim 17.
Brief description of the drawings
The prior art technology and an embodiment of the present invention at present preferred and comprising the significant characteristic features of the present invention will now be described in more detail by way of example and with reference to the accompanying drawings, in which
Figure 1 illustrates a known arrangement according to Figure 2 of the US Patent publication US-A-5 951 761; Figure 2 is an enlarged partial view of a rotatable nozzle included in the arrangement shown in Figure 1 , although the drawing has been supplemented to clarify conditions and requirements associated with the known technology in this case;
Figure 3 is a further enlarged partial view of the nozzle shown in Figure 2 to which sub-units of a viscous plastic material are delivered in an extent corresponding to the properties and requisites associated with the present invention; and
Figure 4 is intended to illustrate schematically a successive build-up of the viscous plastic material to form a coating on the inner surface of the tubular section with the aid of a nozzle which is filled with viscous plastic material to a level above its width; see Figure 3.
Description of known technology
Figures 1 and 2 illustrate a known arrangement for slinging a curable and viscous plastic material against the inner surface (24) of a pipe (22) with the aid of a rotatable nozzle (7) and therewith apply to said surface a lining-forming wear resistant layer (24') of plastic material via a curing process, wherewith said rotatable nozzle (7) is co-ordinated with a bearing unit (19), wherein the nozzle and the bearing unit are adapted for common axial displacement through the pipe (22).
This common displacement is achieved with the aid of a device (23) which functions to centre the nozzle (7) and/or the bearing unit (19) inside the pipe (22). The nozzle (7) is structured to function as a magazine (16) for part of the viscous plastic material and its sub-units fed to the nozzle and imparted rotary motion by the nozzle (7) so that the curable viscous plastic material will be slung from the nozzle (7) onto the internal surface (24) of the pipe (22) through the agency of centrifugal forces that act on the curable viscous plastic material, wherewith the sub-units are slung from the nozzle at a rotational speed corresponding to the speed at which the nozzle rotates. The material sub-units thrown out by the nozzle are given a speed and a direction relating to a velocity component that is dependent on said rotational motion and to a velocity-related component that is dependent on centrifugal forces, wherewith the plastic material sub-units thrown from the nozzle form or are co-ordinated within a hollow cylindrical layer or a collection of low material density and therewith given a helical structure.
The functional content of this prior patent publication makes clear the necessity of accurately structuring the capacity of the arrangement with regard to the infeed of the sub-units E1 of the viscous plastic material in relation to the number of slots (20) provided, the vertical and transversal dimensions of the slots and the number of slots chosen being such that the plastic sub-units fed to the nozzle (7) will be in direct relationship with the plastic sub-units that exit from the nozzle via said slots (20), where a plastic material sub-unit E2 is shown related to a slot (20) in Figure 2. Since the illustrated embodiment includes five such slots (20), the control circuits used shall be structured so that the outfeed of plastic material sub-units from a plastic pump will correspond to five times the number of plastic sub-units E2 slung out per unit of time.
Thus, it is possible to establish a very low material concentration within the plastic sub-units E2 slung out from the nozzle and forming the hollow cylindrical layer on the inner surface of the pipe and therewith achieve a slow build-up of the viscous plastic coating on said inner surface of the pipe in very thin layers and with a relatively low nozzle speed through the pipe.
References are made in this respect to column 2, lines 53 - 67; column 5, lines 39 - 53; and column 5, lines 66 to line 21 of column 6 in said patent publication.
The plastic material sub-units co-ordinated in the magazine have been identified with the reference sign E3 and form an upper delimiting surface E3a, which has been greatly generalized or stylized for the sake of simplification.
Description of embodiments at present preferred
It is pointed out initially that we have chosen to use in the following description of an embodiment that is at present preferred and that includes characteristic features significant of the present invention and illustrated in Figures 3 and 4 of the accompanying drawings special terms and special terminology with the primary intention of illustrating the inventive concept more clearly.
It will be noted, however, that the terms and expressions chosen here shall not be seen as being limited solely to those terms and expressions but that each chosen term or expression shall be interpreted as also including all technical equivalents that function in the same or at least in essentially the same way so as to achieve the same purpose and/or technical effect.
Figures 3 and 4 of the accompanying drawings thus illustrate schematically and in detail the basic requisites of the present invention where the significant properties of the present invention have been concretised in the form of the embodiment at present preferred and described more specifically in the following text.
More specifically, Figures 3 and 4 show that a significant percentage (at least over 80%) of the plastic material E2 slung out by the arrangement shall pass over an upper surface and/or upper edge 7a of the nozzle 7.
This edge may include teeth or like projections (not shown) for imparting to underlying material sub-units (such as E5) a speed corresponding to the rotational speed and peripheral speed of the nozzle 7.
The plastic material layer E2 for the upper curable plastic material slung from the nozzle will be structured as a sub-layer, an upper or uppermost layer E4 that rotates about the rotational axis of the nozzle at a speed lower than the speed at which the nozzle rotates, and an underlying an underlying sub-layer E5 which rotates at a slightly higher speed than the upper layer.
It is assumed that the internal friction of the plastic material does not have time to impart rotation to the material sub-units or the sub-layers E4 and E5 corresponding to nozzle rotation, and neither to the sub-layer E6 unless special measures are adopted in the above indicated sense.
The different rotational speeds and the mutually disparate centrifugal forces between said upper sub-layer E4 and said lower sub-layer E5 means that these sub-layers are orientated intermediately of the sub-layer E6 with mutually different rotational speeds relative to the rotational speed of the nozzle.
According to known technology, the lowermost hollow cylindrical layer E2' shall be given a rotational speed that conforms with the rotational speed of the nozzle 7, although with a material density that is significantly lower than the material density chosen for the layer E2.
The thickness "t" of the layer E2, with structured curable viscous plastic sub-units, is chosen in accordance with the chosen viscosity and structure of the plastic material sub-units E1 , where said thickness is chosen to exceed 1.0 mm.
The directives given in accordance with the present invention enable the thickness "t" to correspond to a chosen distance between an upper edge 7a of the nozzle and the lower surface 19a of the bearing unit 19.
However, there is nothing to prevent the distance between the surface 19a and the edge 7a from being slightly greater than the thickness "t".
The thickness "t" is chosen to be smaller than a chosen depth "d" of the dish-shaped or basin-shaped nozzle 7.
The thick ness "t" will normally be less than 5.0 mm.
The outer diameter of the centring device 23 in relation to the internal diameter of the pipe or tubular section is chosen so as to provide in a straight tubular extension a centring effect within a range corresponding to ± 25% of the internal diameter of the pipe.
The centring device 23 has an elasticity or resilience that provides a centring effect within the range of ± 25% of the internal diameter of the pipe in a straight pipe extension.
The centring device 23 is positioned adjacent to and slightly over the upper layer E2.
The centring device 23 can be displaced relative to and secured in a chosen setting position relative to the bearing unit 19 and/or the motor unit and includes a circular recess 23a to this end.
The extent of the illustrated displacement will preferably be less than 20 mm. An epoxy resin material admixed with reinforcing material, such as glass flakes, is used as said curable plastic material sub-units (E1).
The underlying layer E2' is formed via axially orientated or at least generally axially orientated slots 20 disposed in a hollow cylindrical wall-portion 7b of the nozzle 7.
The chosen width of the slots is smaller than 300% and greater than 150% of the chosen maximum length measurement or width measurement of the reinforcing material included in the curable plastic material. The invention is based on the ability to quickly apply a thick coating 10a on the interior surface 22a of the pipe or tubular section with the aid of a first layer E2 and also with the aid of different sub-layers E4, E6, E5, and with the aid of plastic material sub-units that are slung from the arrangement with a high material density and a high rotational speed which, however, is slightly reduced relative to the speed at which the nozzle rotates, and therewith apply a thin coating 10b on the thick coating 10a when different coating techniques are employed with respect to thickness, material density and rotational speeds.
It will be understood that the invention is not restricted to the exemplifying embodiment described above and that modifications can be made within the scope of the inventive concept illustrated in the accompanying claims.
It will be noted in particular that each described unit and/or circuit can be combined with each other unit and/or circuit within the scope of the accompanying claims in order to achieve a desired technical function.

Claims

1. A method of slinging sub-units of a curable viscous plastic material onto the inner surface (22a) of a tubular section (22) with the aid of a rotatable nozzle (7) such as to form, via a curing process, a lining-forming coating (10) of plastic material, wherein the rotatable nozzle (7) is co-ordinated with a bearing unit and/or a motor unit adapted for common axial displacement through said tubular section, wherein said nozzle (7) is structured to function as a magazine (16) for part (E3) of the plastic material (E1) which is fed towards and into the magazine (16) of said nozzle and which is caused to rotate by the nozzle (7) such that the sub-units of the curable viscous plastic material will be slung from the nozzle (7) by the rotational movement and centrifugal forces acting on said sub-units, wherein the method is characterised by the steps of causing sub-units of plastic material slung from the nozzle to pass partially and in a surplus quantity over a surface and/or edge (7a) of the nozzle (7); causing the sub-units of the curable plastic material to be structured as a layer, an upper layer (E2) and causing said upper layer to rotate around the rotational axis of the nozzle (7) at a speed which is lower than the speed at which the nozzle is chosen to rotate, and at least one underlying layer (E2') that is caused to rotate at a higher speed than said upper layer (E2).
2. A method according to claim 1 , characterised by creating an intermediate layer (E6) between the upper layer (E2) and the underlying layer (E21), and causing the layers to rotate at mutually different speeds in relation to the rotational speed of the nozzle (7).
3. A method according to claim 1 or 2, characterised by giving the intermediate layer (E21) a rotational speed that conforms to the rotational speed of the nozzle (7) although with a material density that is considerably less than the material density chosen for remaining layers.
4. A method according to any one of the preceding claims, characterised in that the thickness (t) of the upper layer (E2) structured from sub- units of curable plastic material is chosen in accordance with a chosen viscosity and chosen structure with respect to said plastic material sub-units.
5. A method according to claim 4, characterised by causing the thickness (t) to exceed 1.0 mm.
6. A method according to claim 4, characterised by causing the thickness to be smaller than a chosen depth of a dish-shaped or basin-shaped nozzle (7).
7. A method according to claim 4, characterised by causing said thickness to be smaller than 5.0 mm.
8. A method according to claim 1 , characterised by giving the centring device (23) a diameter related to the internal diameter of the pipe or tubular section that in a straight tubular section provides a centring facility within a range of ± 25% of the internal diameter of the pipe or tubular section.
9. A method according to claim 1 , characterised by giving the centring device an elasticity or resilience that will provide a centring facility in a straight tubular section within a range of ± 25% of the internal diameter of the pipe or tubular section.
10. A method according to claim 1 , characterised by placing the centring device adjacent to and slightly above said upper layer.
11. A method according to claim 1 , characterised by causing the centring device to be displaceable relative to and securable in a chosen setting position relative to the bearing unit and/or the motor unit.
12. A method according to claim 11 , characterised by causing the extent of said displacement to be shorter than 20 mm.
13. A method according to claim 1 , characterised by using an epoxy resin material that is admixed with reinforcing material, such as glass flakes, as said curable plastic material.
14. A method according to claim 3, characterised by forming the lowermost layer (E2') via axially orientated or generally axially orientated slots in a hollow cylindrical wall-part allocated to the nozzle and terminating in a bottom part.
15. A method according to claim 13 or 14, characterised by forming the lowermost layer (E21) from a few axially orientated or at least generally axially orientated slots (20) in a hollow cylindrical wall-part of the nozzle.
16. A method according to claim 13, 14 or 15, characterised by causing the slots to have a width smaller than 300% and greater than 150% of a chosen maximum measurement of the reinforcing material included in the curable plastic material.
17. An arrangement for slinging a curable plastic material onto the inner surface of a pipe or tubular section with the aid of a rotating nozzle such as to create, via a curing process, a lining-forming wear resistant, gas tight or liquid tight layer of plastic material, wherein the rotatable nozzle (7) is connected to a bearing unit and/or a motor unit (19) adapted for common axial displacement through said tubular section or pipe, wherein said displacement can be achieved with the aid of a centring device (23) which functions to centre the nozzle and/or the bearing unit and/or the motor unit within the tubular sectional pipe, wherein said nozzle (7) is structured to serve as a magazine (16) for part of the plastic material which is fed by means of a material feeder towards the nozzle and the magazine, and wherein said part (E3)is caused to rotate by said nozzle around its rotational axis while causing centrifugal forces to act on the curable plastic material, which is thereby slung from the nozzle, characterised in that the plastic material (E2, E2') slung from the nozzle is intended to partially (E2) pass over a surface and/or an edge (7a) of the nozzle (7); in that the curable plastic sub-units slung out by the nozzle are structured by the form of the nozzle as a layer or collections, an upper layer (E2) which is given a speed of rotation around the rotational axis of the nozzle that is lower than the chosen nozzle speed, and at least one underlying layer (E5, E2') which has a rotational speed that is higher than the speed of the upper layer.
18. An arrangement according to claim 17, characterised in that the arrangement functions to form an intermediate layer between the upper layer and the underlying layer, said layers having mutually different rotational speeds in relation to the rotational speed of the nozzle.
19. An arrangement according to claim 17, characterised in that the nozzle has a form that imparts to the lowermost layer a rotational speed that conforms to the rotational speed of the nozzle, although with a material density that is considerably less than the material density chosen with respect to remaining layers.
20. An arrangement according to any one of the preceding claims 17 - 19, characterised in that the thickness (t) of the layer (E2) structured from curable plastic material is chosen in dependence on the chosen viscosity and structure of said plastic material.
21. An arrangement according to claim 20, characterised in that the thickness (t) exceeds 1.0 mm.
22. An arrangement according to claim 20, characterised in that said thickness (t) is smaller than a chosen depth of a dish-shaped or basin-shaped nozzle.
23. An arrangement according to claim 20, characterised in that the thickness is less than 5.0 mm.
24. An arrangement according to claim 17, characterised in that the centring device has a diameter related to the internal diameter of the tubular section or pipe such that the device will provide a centring facility in a range of ± 25% of the internal diameter of the tubular section or pipe in a straight tubular extension.
25. An arrangement according to claim 17, characterised in that the centring device has an elasticity or a resilience that will provide a centring facility within a region of ± 25% of the internal diameter of the tubular section or pipe.
26. An arrangement according to claim 17, characterised in that the centring device is intended to be placed slightly above said upper layer.
27. An arrangement according to claim 17, characterised in that the arrangement includes means via which the centring device can be displaced relative to and secured in a chosen setting position relative to the bearing unit and/or the motor unit.
28. An arrangement according to claim 27, characterised in that the extent to which said displacement can be made is less than 20 mm.
29. An arrangement according to claim 17, characterised by a curable plastic material that comprises an epoxy resin material mixed with reinforcing material, such as glass flakes.
30. An arrangement according to claim 19, characterised in that said underlying layer (E2) or plastic material collection is formed by axially orientated or at least generally axially orientated slots in a hollow cylindrical wall-part of the nozzle.
31. An arrangement according to claim 29 or 30, characterised in that the width of the slots is less than 300% and more than 150% of a chosen maximum measurement of the reinforcing material included in said curable plastic material.
PCT/SE2006/050036 2005-03-28 2006-03-21 Method and arrangement for forming an inner lining within a section of a tube WO2006104454A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06717120A EP1866567A4 (en) 2005-03-28 2006-03-21 Method and arrangement for forming an inner lining within a section of a tube
NO20072865A NO20072865L (en) 2005-03-28 2007-06-05 Method and layout for forming a casing in a rudder section

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0500678A SE528416C2 (en) 2005-03-28 2005-03-28 Method and arrangement for creating a lining within a pipe section
SE0500678-8 2005-03-28

Publications (1)

Publication Number Publication Date
WO2006104454A1 true WO2006104454A1 (en) 2006-10-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/050036 WO2006104454A1 (en) 2005-03-28 2006-03-21 Method and arrangement for forming an inner lining within a section of a tube

Country Status (4)

Country Link
EP (1) EP1866567A4 (en)
NO (1) NO20072865L (en)
SE (1) SE528416C2 (en)
WO (1) WO2006104454A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE528497C2 (en) 2005-04-07 2006-11-28 Proline Ab Rotatable nozzle arrangement (Eccentric)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279427A (en) 1963-12-20 1966-10-18 United States Steel Corp Centrifugal spraying equipment
US3459586A (en) 1965-06-02 1969-08-05 Inland Steel Co Centrifugal spray coating methods and apparatus
US4414918A (en) 1982-02-11 1983-11-15 Raymond International Builders, Inc. Distributor head for a pipe lining machine
GB2218773A (en) 1988-05-17 1989-11-22 Kaeppeli S Soehne Ag A Lining sewers
GB2226865A (en) * 1988-12-12 1990-07-11 Chemence Ltd Lining pipes
DE4331394A1 (en) 1993-09-15 1995-03-16 Drei Bond Gmbh Apparatus for the internal coating of bores and other recesses
EP0781606A2 (en) 1995-12-05 1997-07-02 AMEC Utilities Limited Method and apparatus for coating the interior of a pipe
DE19805027A1 (en) 1998-02-09 1999-08-12 Bertold Gerdes Centrifugal internal spray coating of pipes
US5951761A (en) * 1995-06-28 1999-09-14 Edstroem; Sten Device for applying an internal coating in tubes
SE524741C2 (en) * 2002-06-20 2004-09-21 Sten Edstroem Method and equipment for sealing and/or renovating pipe involves feed of liquid coating material to at least one mouthpiece pushed through pipe to eject material through at least one aperture against pipe inner wall

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279427A (en) 1963-12-20 1966-10-18 United States Steel Corp Centrifugal spraying equipment
US3459586A (en) 1965-06-02 1969-08-05 Inland Steel Co Centrifugal spray coating methods and apparatus
US4414918A (en) 1982-02-11 1983-11-15 Raymond International Builders, Inc. Distributor head for a pipe lining machine
GB2218773A (en) 1988-05-17 1989-11-22 Kaeppeli S Soehne Ag A Lining sewers
GB2226865A (en) * 1988-12-12 1990-07-11 Chemence Ltd Lining pipes
DE4331394A1 (en) 1993-09-15 1995-03-16 Drei Bond Gmbh Apparatus for the internal coating of bores and other recesses
US5951761A (en) * 1995-06-28 1999-09-14 Edstroem; Sten Device for applying an internal coating in tubes
EP0781606A2 (en) 1995-12-05 1997-07-02 AMEC Utilities Limited Method and apparatus for coating the interior of a pipe
DE19805027A1 (en) 1998-02-09 1999-08-12 Bertold Gerdes Centrifugal internal spray coating of pipes
SE524741C2 (en) * 2002-06-20 2004-09-21 Sten Edstroem Method and equipment for sealing and/or renovating pipe involves feed of liquid coating material to at least one mouthpiece pushed through pipe to eject material through at least one aperture against pipe inner wall

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1866567A4 *

Also Published As

Publication number Publication date
EP1866567A1 (en) 2007-12-19
SE528416C2 (en) 2006-11-07
SE0500678L (en) 2006-09-29
NO20072865L (en) 2007-08-06
EP1866567A4 (en) 2011-05-18

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