WO2017212110A1 - Tuyau et procédé de fabrication d'un tuyau - Google Patents

Tuyau et procédé de fabrication d'un tuyau Download PDF

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Publication number
WO2017212110A1
WO2017212110A1 PCT/FI2017/050407 FI2017050407W WO2017212110A1 WO 2017212110 A1 WO2017212110 A1 WO 2017212110A1 FI 2017050407 W FI2017050407 W FI 2017050407W WO 2017212110 A1 WO2017212110 A1 WO 2017212110A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
cavities
wall structure
ventilation pipe
cavity
Prior art date
Application number
PCT/FI2017/050407
Other languages
English (en)
Inventor
Tomas Andersson
Johan WICKHOLM
Original Assignee
Tuub Oy
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 Tuub Oy filed Critical Tuub Oy
Publication of WO2017212110A1 publication Critical patent/WO2017212110A1/fr

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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
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/075—Arrangements using an air layer or vacuum the air layer or the vacuum being delimited by longitudinal channels distributed around the circumference of a tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/07—Arrangements using an air layer or vacuum the air layer being enclosed by one or more layers of insulation
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes
    • 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
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement

Definitions

  • the invention relates to pipes, in particular ventilation pipes, and manufacturing thereof.
  • the invention relates to polymer pipes, which are provided with thermal insulation.
  • Insulated pipes are needed e.g. in construction works. Typical usage areas for insulated pipes include ventilation channels. Insulation is needed depending on the application area for example to prevent thermal losses and condensated water forming on outer surfaces of pipes. A large portion of pipes used by the construction industry is manufactured from metal and polymer material.
  • Pipes can be insulated by means of an insulating material layer arranged around the outer surface thereof.
  • the insulating material can be e.g. wool, foamed plastic, cardboard or asbestos.
  • gas- or vacuum-insulated pipes are known.
  • publication US 2003/0012918 discloses an insulating sheath of a pipe that consists of adjacent channels that are filled with gas. After filling the channels, the sheath is arranged around a pipe like other insulating materials referred to above, for example using fastening straps, whereby the thermal insulation capability of the pipe increases.
  • Publication GB 1283329 presents a solution, in which between two metallic pipes, there is arranged an also metallic cell structure in order to achieve a pipe with increased insulation value.
  • Such solutions are also known in which a wall of a pipe comprises protrusions on top of which is wrapped an additional layer in order to form an insulating air gap on the surface of the pipe.
  • Such structure is described in publication GB 762800 A.
  • the insulating material can be arranged to the pipe before or after installation of the pipe.
  • insulating is formed by a separate stage of work.
  • the insulation makes the installation of the pipe more difficult, in particular making joints, and often one needs to repair insulation after installation.
  • the installation of the insulation is particularly laborious, because pipes typically comprise turns, branches, and joints and are located in tight spaces.
  • ensuring the insulation in the final installation requires special caution in order to achieve tight insulation. Bad quality or wrong installation can lead to condensation or freezing problems or extra heat loss, depending on the application area.
  • EP 2466185, CN 202660161U and CN 102889435 A disclose pipes comprising insulating rods and cavities in the axial direction of the pipe. In WO 2005/120805A1, the cavities have been arranged helically.
  • a drawback of these solutions is relatively difficult manufacturing process, difficulty of ensuring the tightness of the pipe wall, the need of adhesive materials and/or that when the pipe is cut, the cavity structure is opened and the insulation capability of the pipe decreases significantly.
  • a specific aim is to achieve an insulated pipe, in particular a ventilation pipe, which is simpler to install than known insulated pipes and which maintains its insulating capability when installed.
  • An aim is also to achieve an insulated pipe, which can be manufactured from few raw materials, even from a single raw material.
  • An aim of the invention is additionally to achieve a method of manufacturing such pipe.
  • the insulated ventilation pipe according to the invention comprises a wall structure arranged into pipe form, the wall structure comprising cavities arranged into multiple layers in a radial direction of the pipe.
  • the cavities are formed from thermoplastic polymer arranged as a unitary structure.
  • the cavities are entirely closed and arranged into elongated form and to run tangentially, i.e. perpendicular to the longitudinal direction (and also the radial direction in the case of a circular pipe) of the pipe, around the longitudinal axis of the pipe.
  • the wall structure Due to the unitary structure and multi-layered tangential closed cavity structure, the wall structure forms a self-supporting bar and at the same time serves as a structure forming the actual air flow channel and as a thermal insulator.
  • softened thermoplastic polymer is extruded into pipe form, whereby the wall structure is in the extrusion provided with elongated cavities in the tangential direction of the pipe in multiple layers in the radial direction of the pipe so as to form a self-supporting wall structure.
  • thermoplastic polymers offer a sufficient thermal insulation capability for many applications without cumbersome separate pre- or post-installed insulation materials.
  • the unitary structure with its cavities makes the pipe rigid and allows for cuts and continuations with tight joints both between the inner pipes and cavity structures. Thus, it is possible to obtain a whole insulated fluid channel rapidly.
  • the rigid wall structure thus allows for using the pipe as such, in contrast to solutions, in which a flexible cavity insulator in arranged separately on an uninsulated pipe.
  • Directly tangential and closed cavities provide the advantage that the cavities remain intact when the pipe is cut, whereby its insulation capability is maintained.
  • the insulation capability of a pipe with axial or helical is decreased along the whole length of the pipe irrespective of where the pipe is cut at.
  • the material can be fresh polymer raw material or on the other hand also recycled material, or a mixture thereof. Particularly preferably at least a portion of the material is recycled material.
  • the present cavity structure improves not only the thermal insulation, but also acoustic insulation. Thus, is can be used in targets, where the prevention of heat losses is not necessary but in which transportation of sound along a pipeline is to be decreased.
  • the cavities are arranged into at least three layers in the radial direction of the pipe.
  • a line drawn over the wall structure intersects with at least three different cavities.
  • the cavities are arranged interlaced with each other, i.e., partly overlapping, into layers such that in the radial direction of the pipe each location of the pipe has at least one cavity, in particular at least two cavities.
  • the separating walls of the cavities have been positioned in the axial and/or tangential directions to different places, whereby no direct polymer bridges, i.e. "cold bridges" are formed between the inner and outer surfaces of the pipe.
  • polymers have a relatively low thermal conductivity compared with e.g. metals, this kind of an intermediate wall structure has been found to be significantly better compared with intermediate walls along a straight line.
  • the cavities on superimposed layers are in a shifted position with respect to each other by half cavity dimension, which minimizes the conduction of heat through the polymer.
  • the pipe comprises cavities, which are closed on all sides thereof, that is, axially, radially and tangentially, closed air and water-tightly.
  • cavities are closed on all sides thereof, that is, axially, radially and tangentially, closed air and water-tightly.
  • These kind of completely closed cavities minimize heat convection inside the wall structure along the mantle of the pipe and further improves thermal insulation.
  • Axially closed cavities are preferred, because in that case the pipe can be cut without opening the cavities, whereby the insulation level is easy to maintain in continuation and joint locations.
  • the cross-sectional shape of the cavities can hexagonal or rectangular, for example.
  • the pipe consists solely of the cavity structure, that is, is does not contain other layers in addition to the cavity layers forming the wall structure.
  • the cavities have been vacuumized or filled with gas, such as air, i.e. are free from solid-state insulator materials.
  • gas such as air
  • the wall structure with its cavities is entirely manufactured form the same polymer material.
  • the polymer material can be a mixture of several polymers and comprise fresh polymer, recycled polymer, or both.
  • the polymer comprises recycled plastic, typically 30 - 100 % by weight, preferably 50 - 100 % by weight of the total amount of polymer.
  • the pipe i.e., the wall structure with the cavities, can be manufactured by extruding one or more, preferably only one, thermoplastic polymer or polymer blend into pipe form.
  • the extrusion process can comprise a co-extrusion process, in which at least the inner wall of the pipe is extruded in a first work stage, at least some of the cavity layers in a second work stage and uniting the inner wall and the cavity layers on top of each other in order fo form the insulated pipe.
  • Figs. 1 A and IB show in perspective and planar cross-sectional views the present pipe structure according to an embodiment, where the cavities are elongated and arranged to circumvent the pipe tangentially.
  • Figs. 1C and ID show as side and end views sections of the present pipe according to one embodiment.
  • Figs. IE - 1G show in perspective views alternative cavity structures, in which the cavities circumvent the pipe tangentially.
  • Fig. 2 shows schematically a hexagonal cavity structure.
  • Fig. 3 shows as a cross-section in the plane perpendicular to the longitudinal axis of the pipe an example of a rectangular pipe.
  • Axial direction refers herein to the longitudinal direction of the pipe and “radial direction” to the direction(s) perpendicular to the axial direction and intersecting the centre of symmetry and/or mass of the pipe.
  • Tortal direction refers to direction
  • Cavity means a limited zone defined by the wall structure, the zone being capable of being filled with gas, such as air, or vacuumized.
  • An individual cavity is limited by polymer walls.
  • the wall structure thus consists of walls between cavities, the inner side of the pipe and/or the outer side of the pipe.
  • “limited” is a zone, which has been limited at least in the radial and tangential directions. Cavities, or at least part of the cavities, can be limited also in the axial direction, i.e. entirely closed. In particular at the ends of the pipe, the cavities can be open, even though typically at the latest at the installation or joining stage potentially open cavities are closed also at the ends of the pipe in order to improve the insulation capability.
  • cavity means a hollow or channel formed inside plastic material, at least one dimension of the cavity being larger than an open or closed cell formed inside an expanded plastic material by means of foaming.
  • the wall structure comprising multiple cavity layers arranged on top of each other in the radial direction of the pipe means that when inspecting an inner cross-section of the pipe in at least some radial directions, a line drawn over the wall structure intersects with at least two, preferably at least three, different cavities.
  • this condition is satisfied in all radial directions in at least some axial locations of the pipe, preferably in most axial locations. In some embodiments, this condition is satisfied in all axial locations of the pipe.
  • Elongated cavity means a cavity, whose dimension in at least one direction thereof is at least three times, suitably 3,5-1000 times its dimensions perpendicular to this direction. According to the invention, the cavity is an elongated, in the tangential direction ring- shaped or arc-shaped cavity.
  • the average diameter of the cavities is 0,5 - 100 mm, for example 0.75 - 50 mm or 1 - 20 mm.
  • the diameter of the cavities can vary according to the inner diameter of the pipe, as will be discussed later in more detail.
  • the diameter of one cavity is about 1 - 25 % of the inner diameter of the pipe and the cross-sectional area of a cavity is 0.1 - 10 % of the inner cross-sectional area of the pipe.
  • the total cross-sectional area of the cavities is about 10 - 500 %, for example about 30 - 200 % of the inner cross-sectional area of the pipe.
  • "Unitary" structure of the wall structure or cavities means a structure in which at least the cavity wall-forming thermoplastic polymer is arranged as a continuous structure. Thus, no adhesives are used between different parts of the wall structure, and neither any other substances or means that hold the wall structure together, but the wall structure is substantially free from such substance or means.
  • a unitary structure can contain zones, whose polymer compositions differ from each other, but in particular the unitary structure may comprise a polymer structure consisting of essentially homogeneous polymer material, including homopolymers, copolymers and essentially homogeneous polymer blends.
  • Unitary structure does not exclude that for example the inner or outer surface of the pipe is coated with a separate material layer, which does not consist of thermoplastic polymer, but the term refers particularly to the unity of the cavity -forming structure.
  • a separate material layer which does not consist of thermoplastic polymer, but the term refers particularly to the unity of the cavity -forming structure.
  • a metal layer such as an aluminium foil, or other coating, around the outer surface of the pipe.
  • the unitary structure can be achieved by polymer extrusion.
  • the structure is manufactured by extrusion or a corresponding fabrication method, in which molten plastic mass is pressed through a nozzle so that the cavity structure is formed in such pressing stage.
  • the structure is formed without foaming, whereby the cavities of the structure do not contain cells due to expansion of plastic.
  • Figs. 1 A - IE show a pipe structure according to one embodiment, in which the cavities run in a ring-like manner, i.e. tangentially, around an inner pipe.
  • the pipe comprises a wall structure 10, which further comprises an inner wall 11 and outer wall 11 oriented parallel to the mantle (cylindrically) and intermediate walls 12, 13 oriented parallel to the mantle between these.
  • the actual fluid channel is formed inside the inner wall.
  • the wall structure has been provided with intermediate walls 15 A, 15B, 15C in a plane perpendicular to the axial direction of the pipe.
  • the inner and outer walls 11, 14 and intermediate walls 13, 15A, 15B, 16C together form cavities 16A, 16B, 16C between them.
  • the cavities 16A, 16B, 16C have in this example been arranged in three layers, each of which comprises several cavities circumventing the pipe tangentially side by side.
  • the number of layers can however be for example 2 or 4 - 10.
  • the cavities are rectangular in cross section, i.e. the inner, outer and intermediate walls are essentially of constant thickness and arranged at right angles with respect to each other.
  • the cavities 16A, 16B; 16B, 16C of successive layers have been arranged such that their radial-direction intermediate walls are not situated on the same line, but shifted with respect to each other, herein by half cavity distance. This prevents formation of direct cold bridges between the inner and outer falls of the pipe, which improves heat insulation.
  • Figs. 1 A - ID there are provided additional cavities 18 protruding from the outer wall 14 of the pipe, which, however, do not form a full layer, but provide an uneven, "wrinkled" outer surface to the pipe. This can be desirable in some applications.
  • the protruding cavities 18 increase the thermal insulation value of the pipe for their part.
  • Such protruding cavities 18 are not necessary.
  • the outer surface of the pipe can be defined by the outermost full cavity layer, i.e., be even.
  • Fig. IF shows a wall structure, in which the cavities 170A, 170B, 170C circumventing the pipe in ring-like manner are circular in cross-section and polymer fills zones between the cavities.
  • Fig. 1G shows a cavity structure, in which the cavities 180B, 180C, 180D circumventing the pipe in ring-like manner are hexagonal in cross-section (excl. the innermost,
  • Fig. 2 shows a variation, in which the cavities 36A are hexagonal in cross-section and arranged tangentially like in Figs. 1A - ID, herein into four layers.
  • FIG. 3 shows an example of an essentially rectangular cross-section pipe, whose wall structure 40 comprises two cavity layers.
  • the cavities 46 are elongated and extend in the tangential direction of the pipe.
  • the largest transverse inner dimension of the pipe i.e. inner diameter, is typically 30 - 500 mm, in particular 50 - 250 mm, in a ventilation pipe most typically 70 - 200 mm.
  • the thickness of the wall structure can be e.g. 30 - 150 mm, typically 40 - 100 mm.
  • the radial dimension of a single cavity can be e.g. 1 - 30 mm, typically 3 - 20 mm.
  • one or both ends of the pipe comprise, as a unitary polymer structure, a joint portion, whose inner and/or outer dimension differs from the
  • the joint portion can comprise e.g. a socket, whose inner diameter is the same or larger than a basic diameter of the pipe.
  • the joint portion can be arranged to engage with an essentially similar or different kind of a pipe in order to achieve a pipe extension or pipe joint. Two pipes can be joined also by means of a separate joint part.
  • the joint portion is adapted to make tight both inner and outer walls of two pipes, and optionally also the intermediate walls such that both the integrity of the fluid channel and insulation capability of the wall structure is maintained at the location of the joint.
  • This kind of sealing can be achieved e.g. by means of a diameter reduction and/or socket and a separate sealing part, such as a sealing ring.
  • Such joint can be arranged as air tight, whereby the pipe can be steam washed, if necessary.
  • the pipe comprises a self-supporting rigid bar. The length of the bar can be e.g. 1 - 10 m.
  • the pipe can be manufactured from any natural of synthetic thermoplastic polymer material. Examples include polyvinylchloride in different forms thereof (PVC, UPVC, CPVC), polypropene (PP), polycarbonate (PC), polyethylene (PE), in particular in cross- linked form (PEX), polystyrene (PS), polymethylmetacrylate (PMMA), acrylonitrile butadiene styrene (ABS), polybutylene (PB), polyvinylidene fluoride (PVDF), Nylon or other polyamide, or blends or derivatives of these.
  • the pipe comprises recycled thermoplastic polymer material, which can be one or more of the abovementioned polymers.
  • the pipe is manufactured from hard, unfoamed plastic, in contrast to cell plastics having gas foamed therein. Thus, a tight, hard and strong, but still well heat- insulating pipe due to the cavity structure is obtained.
  • additives within the polymer can be typical additives used in the art, such as UV protection agents, colorants, fillers or reinforcements.
  • the present pipe can be manufactured entirely in an extrusion process in one or more extrusion stages.
  • the manufacturing process consists of coextrusion, in which the yield of two or more extruders is combined into one continuous pipe item.
  • the inner wall 11 and first outwards-directed intermediate walls 15A can be produced with a first extruder and the first intermediate mantle 12 and second outwards- directed intermediate walls 15B with a second extruder etc.
  • the extrudates are joined, whereby the cavity structure is formed.
  • the number of coextruders can be e.g. 2 - 10, typically 2 - 6.
  • the pipe is a ventilation pipe.
  • This can be installed for example as part of a ventilation system comprising at least one heat pump and/or heat recovery machine.
  • a ventilation system comprising at least one heat pump and/or heat recovery machine.
  • there is a large difference between the inner and outer temperatures of the pipe whereby the risk of condensed water is high without heat insulation.
  • a particular risk for condensed water damages outside the pipe is in cooling systems, in which cooler air is carried by the pipe.
  • An insulated pipe can provide benefits also in other kinds of ventilation systems, that is, it can be used with all ventilation solutions, including cooling and heating solutions.
  • the pipe joint technique can be e.g. a simple socket or rubber seal joint, by which primarily the joining of the actual fluid channels (inner pipes) of the pipes air/water tightly is ensured.
  • Hex pipe a wall structure consisting of hexagonal cavities
  • CFD computational fluid dynamics

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Thermal Insulation (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un tuyau de ventilation isolé. Le tuyau comprend une structure de paroi isolante (10) adaptée à la forme du tuyau, la structure de paroi comprenant des cavités allongées (16A-C) disposées en plusieurs couches dans une direction radiale du tuyau, la structure de paroi étant formée à partir d'un polymère thermoplastique agencée selon une structure unitaire de sorte que la structure de paroi forme une barre autoporteuse. Selon l'invention, les cavités allongées de la structure de paroi sont entièrement fermées et adaptées pour s'étendre de manière tangentielle, perpendiculaire à la direction longitudinale du tuyau, autour de l'axe longitudinal du tuyau. Le tuyau isolé de l'invention est simple à fabriquer et à installer.
PCT/FI2017/050407 2016-06-07 2017-05-31 Tuyau et procédé de fabrication d'un tuyau WO2017212110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20165472A FI127375B (fi) 2016-06-07 2016-06-07 Putki ja menetelmä putken valmistamiseksi
FI20165472 2016-06-07

Publications (1)

Publication Number Publication Date
WO2017212110A1 true WO2017212110A1 (fr) 2017-12-14

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PCT/FI2017/050407 WO2017212110A1 (fr) 2016-06-07 2017-05-31 Tuyau et procédé de fabrication d'un tuyau

Country Status (2)

Country Link
FI (1) FI127375B (fr)
WO (1) WO2017212110A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113586813A (zh) * 2021-07-27 2021-11-02 中国人民解放军国防科技大学 一种能够热补偿的高温流体通道

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1166668A (fr) * 1957-02-05 1958-11-13 Gaine thermo-isolante pour canalisations
WO2011057994A1 (fr) * 2009-11-12 2011-05-19 Solvay Sa Segment incurvé à paroi multicouche en matière plastique pour assembler des tuyaux

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1166668A (fr) * 1957-02-05 1958-11-13 Gaine thermo-isolante pour canalisations
WO2011057994A1 (fr) * 2009-11-12 2011-05-19 Solvay Sa Segment incurvé à paroi multicouche en matière plastique pour assembler des tuyaux

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113586813A (zh) * 2021-07-27 2021-11-02 中国人民解放军国防科技大学 一种能够热补偿的高温流体通道

Also Published As

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FI127375B (fi) 2018-04-30
FI20165472A (fi) 2017-12-08

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