DE2316835A1 - Corrugated extruded plastic pipe - including foamed plastic layer to provide insulation - Google Patents

Corrugated extruded plastic pipe - including foamed plastic layer to provide insulation

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Publication number
DE2316835A1
DE2316835A1 DE2316835A DE2316835A DE2316835A1 DE 2316835 A1 DE2316835 A1 DE 2316835A1 DE 2316835 A DE2316835 A DE 2316835A DE 2316835 A DE2316835 A DE 2316835A DE 2316835 A1 DE2316835 A1 DE 2316835A1
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DE
Germany
Prior art keywords
plastic
calibration mandrel
foamable
mandrel
profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE2316835A
Other languages
German (de)
Other versions
DE2316835B2 (en
DE2316835C3 (en
Inventor
Max Dipl Kfm Ing Pernsteiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KAGERER EISEN KUNSTSTOFF
Original Assignee
KAGERER EISEN KUNSTSTOFF
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Publication date
Application filed by KAGERER EISEN KUNSTSTOFF filed Critical KAGERER EISEN KUNSTSTOFF
Publication of DE2316835A1 publication Critical patent/DE2316835A1/en
Publication of DE2316835B2 publication Critical patent/DE2316835B2/en
Application granted granted Critical
Publication of DE2316835C3 publication Critical patent/DE2316835C3/en
Expired legal-status Critical Current

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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
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
    • B29C44/16—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining shaped by the expansion of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
    • B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
    • B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/94—Lubricating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2016/00—Articles with corrugations or pleats
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/18—Pleated or corrugated hoses

Landscapes

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

Abstract

An extruded plastic tube is supported around a cylindrical former and corrugating moulds are closed around the tube. The components of a foamed plastic (e.g. polyurethane) are then introduced (pref. through a duct in the former) between the tube and former at spaced posns so that as the plastic foams the tube is forced to take up the shape of the moulds. On solidification the foamed plastic fills the annular cavities formed by the corrugations of the tube so that the inside of the tube is smooth.

Description

Verfahren zum kontinuierlichen Herstellen und Formen von aus zwei oder mehreren Schichten bestehenden Kunststoff-Hohlprofilen und Vorrichtung für die Durchführung des Verfahrens Gegenstand der Erfindung sind ein Verfahren und eine Vorrichtung zum kontinuierlichen Herstellen und Querformen, z.B. Wellen von aus zwei oder mehreren Kunststoffschichten bestehenden Hohlprofilen, vorzugsweise von Rohren und im Querschnitt rechteckigen Hohlprofilen, wobei mindestens eine Schicht aus einem Schaumkunststoff besteht. A method of continuously making and molding from two or multilayer plastic hollow profiles and device for the implementation of the method The invention relates to a method and a device for the continuous production and transverse shaping, e.g. waves of hollow profiles consisting of two or more plastic layers, preferably of tubes and hollow profiles rectangular in cross section, with at least one layer consists of a foam plastic.

Aus einer, zwei oder mehreren Schichten und einer Schaum-Eunststoffsehitht bestehende quergeformte Hohlprofile nach dem erfindungsgemäßen Verfahren haben gegendber den bekannten Hohlprofilgen die folgenden Vorteile: Die äußere und innere Oberfläche können aus unterschiedlichen Kunststoffen gefertigt sein und daher für die ßnforderungen an das Profilinnere und das Profiläußere, die unterschiedlich sein können, jeweils optimal gewählt werden. Made of one, two or more layers and a foam synthetic layer existing transversely shaped hollow profiles according to the method according to the invention have opposite the known hollow profile the following advantages: The outer and inner surface can be made of different plastics and therefore for the requirements to the inside and outside of the profile, which may be different, respectively be optimally chosen.

Die innere glatte Oberfläche des Hohlprofiles oder Rohres weist einen geringen Widerstand bei Gas- und Fitissigkeitsströmungen od.dgl. auf. The inner smooth surface of the hollow profile or tube has a low resistance to gas and fitness currents or the like. on.

Der Wärmeübergang ist in beiden Richtungen (von innen nach außen und von außen nach innen) wegen der guten Isoliereigenschaften des Kunststoffschaumes relativ gering. The heat transfer is in both directions (from the inside to the outside and from the outside to the inside) because of the good insulating properties of the plastic foam relatively low.

Durch Querformen, z.B. durch Wellen wird der Widerstand des Hohlprofiles gegen Innen- und Außendruck relativ hoch bei niedrigem Materialaufwand und niedrigem Gewicht. The resistance of the hollow profile is increased by transverse shaping, e.g. by waves Relatively high against internal and external pressure with low material costs and low Weight.

Bei Verwendung des quergeformten bz;#r. gewellten Profiles oder Rohres als Schutzrohr für einzuziehende Kabel, Dr2hte-od.-dgis treten beim Einziehen wegen der glatten inneren Oberfläche keine Schwierigkeiten durch Festhaken in inneren Wellen, besonders bei Bögen, auf. When using the horizontally shaped bz; #r. corrugated profile or pipe as a protective tube for cables to be pulled in, wires or dgis occur when pulling in The smooth inner surface poses no difficulties from getting stuck inside Waves, especially on arches.

Das quergeformte Profil oder Rohr weist eine hohe Blexibilität auf und ist trotzdem innen glatt. The cross-shaped profile or tube has a high degree of flexibility and is still smooth on the inside.

Zur Durchführung des Verfahrens wird gemäß Fig. 1 ein Rohr oder Profil aus Kunststoff durch einen im allgemeinen wie üblich gestalteten Presskopf 1 extrudiert, über einen Kalibrierdorn 2 geführt und von einer das Profil oder Rohr außen umfassenden, z.B. von einem es umfassenden, aus einzelnen Matrizen 3 bestehenden Eettenabzúg aufgenommen, gefördert und gezogen. Der Dorn 4 des Presskopfes und, in seiner Fortsetzung, der Kalibrierdorn 2 weisen eine zentrale Bohrung 5 auf, durch die die für die Erzeugung von Kunststoffschaum notwendigen Komponenten 6 und -falls erforderlich - Fördergas (Luft) zugeführt werden. Diese Komponenten werden von innen an das bereits aus dem Presskopf ausgetretene Profil 7 gesprüht, schäumen auf, erzeugen einen Druck gegen das extrudierte Profil und pressen dieses gegen die umlaufende, es von außen umfassende Form 3. Das Kunststoffprofil wird daher in die es von außen umfassende Form gepresst und nach dieser geformt. To carry out the method, a pipe or profile is shown in FIG extruded from plastic through a compression head 1 generally designed as usual, guided over a calibration mandrel 2 and from a profile or pipe surrounding the outside, E.g. from a comprehensive Eettenabzúg consisting of individual matrices 3 picked up, promoted and drawn. The mandrel 4 of the press head and, in its continuation, the calibration mandrel 2 have a central bore 5 through which the for the generation of plastic foam necessary components 6 and - if necessary - conveying gas (Air) are supplied. These components are connected from the inside to the Pressing head leaked profile 7 sprayed, foam up, generate a pressure against the extruded profile and press it against the circumferential, encompassing it from the outside Form 3. The plastic profile is therefore pressed into the form surrounding it on the outside and shaped according to this.

Es ist auch möglich, gemäß Fig. 2 ein aus drei Schichten bestehendes Hohlprofil oder Rohr in der Form herzustellen, daß die äußere Schicht aus ungeschäumtem Kunststoff 11, die-mittlere Schicht aus geschäumtem Kunststoff 12 und die innere Schicht wie der aus ungeschäumtem Kunststoff 13 besteht. It is also possible, according to FIG. 2, to have a three-layer structure Manufacture hollow profile or pipe in the form that the outer layer of non-foamed Plastic 11, the middle layer of foamed plastic 12 and the inner Layer like the one made of non-foamed plastic 13.

Zur Durchführung dieses Verfahrens wird die äußere schicht 11 des Profiles oder Rohres aus nichtschäumbarem Kunststoff durch den äußeren Kanal 14 einer an sich bekannten Doppelpressdüse 15 extrudiert, die mittlere schäumbare Kunststoffschicht durch den inneren Kanal 16 der Doppeldüse 15, und die dann effektiv innere Schicht 13 aus nicht schäumbarem Kunststoff durch die zentrale Bohrung 17 der Doppelpressdüse und, in deren Verlängerung, durch die Bohrungen 18 des Kalibrierdornes 19 gefördert. To carry out this process, the outer layer 11 of the Profile or pipe made of non-foamable plastic through the outer channel 14 a known double press nozzle 15 extruded, the middle foamable plastic layer through the inner channel 16 of the double nozzle 15, and the then effectively inner layer 13 made of non-foamable plastic through the central bore 17 of the double press nozzle and, in their extension, conveyed through the bores 18 of the calibration mandrel 19.

Die mittlere schäumbare Kunststoffschicht schäumt nach dem Verlassen der Doppelpressdüse 15 und nach dem Eintreten des Profiles in die aus einzelnen Matrizensegmenten 20 bestehende umlaufende Form auf, erzeugt einen Druck gegen die innere und gegen die äußere Schicht und presst die äußere Schicht gegen die umlaufende, alle drei Schichten von außen umfassende, aus den Natrizensegmenten 20 bestehende äußere Form. Die äußere Eunststoffschicht wird daher in die es von außen umfassende, umlaufende Form gepresst, nach dieser geformt, während die innere Schicht gegen den zylindrischen Kalibrierdorn 19 gedrückt und daher zylindrisch und glatt geformt wird. The middle foamable plastic layer foams after leaving the double press nozzle 15 and after the entry of the profile in the individual Die segments 20 existing circumferential shape, creates a pressure against the inner and against the outer layer and presses the outer layer against the circumferential, all three layers from the outside, consisting of the sodium segments 20 outer shape. The outer plastic layer is therefore integrated into the Circumferential shape pressed, shaped according to this, while the inner layer against pressed the cylindrical calibration mandrel 19 and therefore shaped cylindrical and smooth will.

Der durch die zentrale Bohrung des Preßkopfes und die Bohrungen des Kalibrierdornes zugeführte schäumbare oder nicht schäumbare Kunststoff kann zur Erleichterung des Gleitens der aus ihm gebildeten inneren Schicht des Profiles mit einem Gleitmittel z.B. mit einem Gleitwachs vermischt werden. Außerdem kann durch eine zusätzliche Bohrung im Preßkopf und in der Kalibrierdüse Gleitmittel so zugeführt werden, daß sich eine dünne flüssige Gleitmittelschicht auf der Oberfläche des Kalibrierdornes bildet und ein Festkleben des Kunststoffes oder des sohäumbaren Kunststoffgemisches an dem Kalibrierdorn verhindert wird. The through the central hole of the press head and the holes of the Calibrating mandrel supplied foamable or non-foamable plastic can be used for Facilitating the sliding of the inner layer of the profile formed from it be mixed with a lubricant, e.g. with a glide wax. Also can through an additional hole in the press head and lubricant in the calibration nozzle that there is a thin liquid lubricant layer on the surface of the calibration mandrel forms and a sticking of the plastic or the foamable plastic mixture is prevented on the calibration mandrel.

Wird ein schäumbares Hunststoff-Gemisch durch die Bohrungen des Kalibrierdornes zugeführt, wird also die innere Schicht des Profiles aus einem Kunststoff-'chaum gebildet, so wird das für die Zuführung des Gemisches erforderliche Fördergas unmittelbar an der Oberfläche des Kalibrierdornes durch in Richtung der Hauptachse, über den Umfang und schraubenförmig verlaufende Nuten im Kalibrierdorn abgeführt. A foamable mixture of plastics is poured through the holes in the calibration mandrel supplied, so the inner layer of the profile is made of a plastic foam formed, the conveying gas required for supplying the mixture is immediately generated on the surface of the calibration mandrel through in the direction of the main axis, over the Circumference and helical grooves in the calibration mandrel.

Diese Nuten sind hinsichtlich ihrer Äbmessungen und hinsichtlich ihrer Führung auf die abzuführende Fördergasmenge so abgestimmt, daß zwischen Kalibrierdorn und innerer Schicht des Kunststoffprofiles eine dünne Gasschicht zur Erleichterung des Gleitens während der ganzen Produktionsdauer aufrecht erhalten wird, -Eine weitere Erleichterung des Gleitens der inneren Schicht auf dem Kalibrierdorn wird dadurch erzielt, daß der Kalibrierdorn aus einem Material mit niedrigem Reibungskoeffisienten gegenüber dieser inneren Schicht des Profiles z.B. aus Polytetrafluoräthylen besteht. These grooves are in terms of their dimensions and in terms of their leadership is matched to the amount of conveyed gas to be discharged so that between the calibration mandrel and inner layer of the plastic profile a thin layer of gas for relief of sliding is maintained during the entire production period, -Another one This makes it easier for the inner layer to slide on the calibration mandrel achieved that the calibration mandrel made of a material with a low coefficient of friction opposite this inner layer of the profile, for example, consists of polytetrafluoroethylene.

Claims (11)

Pat entan sprüche: Pat ent claims: erfahren zum kontinuierlichen Herstellen und Formen von aus zwei oder mehreren Schichten bestehenden Kunststoff-Hohlprofilen, dadurch gekennzeichnet, daß mindestens eine Schicht des aus zwei oder mehreren Schichten bestehenden Hohlprofiles aus schäumbarem Kunststoff hergestellt ist. experienced in the continuous production and shaping of two or multiple layers of plastic hollow profiles, characterized in that that at least one layer of the hollow profile consisting of two or more layers is made of foamable plastic. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Hohlprofil während der Herstellung quergeformt, vorzugsweise mit einer Querquellung versehen und hierzu in eine es umfassende, es kontinuierlich fördernde Borm- und Fördervorrichtung geführt wird. 2. The method according to claim 1, characterized in that the hollow profile shaped transversely during manufacture, preferably provided with transverse swelling and for this purpose in an encompassing, continuously conveying Borm- and conveying device to be led. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die für die Querformung, vorzugsweise Querquellung des Eunststoff-Hohlprofiles erforderliche Formänderungsarbeit durch das Aufschäumen des schäumbaren Kunststoffmateriales ausschließlich oder in Verbindung mit der Energie des Fördergases für die Zuführung des schäumbaren Kunststoffmateriales und/oder in Verbindung mit dem Einwirken von Atmosphärenunterdruck auf die äußere Oberfläche des Profiles eingebracht wird. 3. The method according to claim 1 or 2, characterized in that the necessary for the transverse shaping, preferably transverse swelling of the hollow plastic profile Deformation work by foaming the foamable plastic material exclusively or in connection with the energy of the conveying gas for the supply of the foamable Plastic material and / or in connection with the action of negative atmospheric pressure is introduced onto the outer surface of the profile. 4. Verfahren nach den Ansprüchen 1, 2 oder 3, dadurch gekennzeichnet, daß dem für die Herstellung der inneren Schicht des Kunststoff-Hohlprofiles Verwendung findenden schäumbaren oder nicht schäumbaren Gemisch solche Zusätze, Gleitmittel, zugefügt werden, die sich bei Temperaturen unter 13000 verflüssigen, sich in dem die innere Schicht des Hohlprofiles bildenden Kunststoffmaterial nicht vollständig lösen und daher während des Herstellprozesses des Kunststoff -Hohlprofiles eine flüssige Gleitschicht auf der Oberfläche des Kalibrierdornes, über den die innere Schicht des Hohiprofiles gleiten muß, ausbilden. 4. The method according to claims 1, 2 or 3, characterized in that that the use for the production of the inner layer of the plastic hollow profile find foamable or non-foamable mixture such additives, lubricants, be added, which liquefy at temperatures below 13,000, in the the inner layer of the hollow profile forming plastic material not completely solve and therefore during the manufacturing process of the plastic Hollow profile a liquid sliding layer on the surface of the calibration mandrel, over which the inner layer of the hollow profile must slide, train. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Gleitmittel getrennt von dem zur Herstellung der inneren Schicht des Hohlprofiles dienenden Kunststoffgemisch zugeführt und auf der Oberfläche des Kalibrierdornes verteilt werden. 5. The method according to claim 4, characterized in that the lubricant separated from the one used to produce the inner layer of the hollow profile Plastic mixture supplied and distributed on the surface of the calibration mandrel will. 6. Vorrichtung zur vorteilhaften Durchführung des Verfahrens für die Herstellung von Hohlprofilen gemäß den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß der Dorn (4) der Pressdüse (1) über das Ende der Preßdüse hinaus als Kalibrierdorn (2) verlängert ist und beide Dorne mit Bohrungen (5) für die Zuführung von schäumbaren oder nicht schaumbaren Kunststoffgemisch ausgestattet sind, wobei der Kalibrierdorn mindestens 200 mm-weit in die Strecke der Form- und Fördervorrichtung hineinragt, in der die einzelnen Matrizen der iorm- und Fördervorrichtung eine geschlossene, sich kontinuierlich bewegende Form bilden. 6. Device for the advantageous implementation of the method for the production of hollow profiles according to claims 1 to 5, characterized in that that the mandrel (4) of the press nozzle (1) beyond the end of the press nozzle as a calibration mandrel (2) is extended and both mandrels with holes (5) for the supply of foamable or non-foamable plastic mixture, the calibration mandrel protrudes at least 200 mm into the section of the forming and conveying device, in which the individual matrices of the iorm and conveyor device form a closed, Form continuously moving shape. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß der Kalibrierdorn auf seiner Oberfläche mit Nuten versehen ist, die einerseits durch Verringerung der Auflagefläche der inneren Schicht des Kunststoff-Hohlprofiles auf dem Kalibrierdorn dessen Gleiten auf dem Kalibrierdorn erleichtern und, andererseits, zur Abfuhr des für die Zuführung des Kunststoffgeoisches in manchen Fällen erforderlichen Fördergases dienen, wobei die Nuten für die Erfüllung dieser Aufgaben entweder über den Umfang des Kaiibrier-# dornes, senkrecht zu dessen Hauptachse, verlaufes schraubenförmig oder gerade in Richtung der Hauptachse des Kalibrierdornes verlaufend angeordnet sind. 7. Apparatus according to claim 6, characterized in that the calibration mandrel is provided on its surface with grooves, on the one hand by reducing the contact surface of the inner layer of the plastic hollow profile on the calibration mandrel facilitate its sliding on the calibration mandrel and, on the other hand, to remove the conveying gas required in some cases for supplying the plastic gas serve, with the grooves for the fulfillment of these tasks either over the scope of the calibration mandrel, perpendicular to its main axis, runs helically or arranged to run straight in the direction of the main axis of the calibration mandrel are. 8. Vorrichtung nach den Ansprüchen 6 oder 7, dadurch gekennzeichnet, daß der Kalibrierdorn oder mindestens seine Oberfläche aus Polytetrafluoräthylen, Polytrifluorchloräthylen oder aus einem Material mit vergleichbar geringem Reibungskoeffizient besteht. 8. Device according to claims 6 or 7, characterized in that that the calibration mandrel or at least its surface is made of polytetrafluoroethylene, Polytrifluorochloroethylene or a material with a comparably low coefficient of friction consists. 9. Vorrichtung nach den Ansprüchen 6, 7 oder 8, dadurch gekennzeichnet, daß der Dorn der Preßdüse und in dessen Verlängerung der Kalibrierdorn zusätzliche Bohrungen für die Zuführung von Gleitmitteln besitzen, die, in gleicher Weise wie die Bohrungen für die Zuführung des schäumbaren oder nichtschäumbaren Gemisches, aus dem die innere Schicht des Kunststoffprofiles hergestellt wird, durch beide Dorne bis an die Oberfläche des Kalibrierdornes verlaufen. 9. Device according to claims 6, 7 or 8, characterized in that that the mandrel of the press nozzle and in its extension the calibration mandrel additional Have holes for the supply of lubricants, which, in the same way as the holes for feeding the foamable or non-foamable mixture, from which the inner layer of the plastic profile is made, by both The mandrels run up to the surface of the calibration mandrel. 10. Vorrichtung nach den Ansprüchen 6, 7, 8 oder 9, dadurch gekennzeichnet, daß sowohl die Form- und Fördereinrichtung wie auch der Kalibrierdorn durch Kühlung auf Temperaturen unter 100 0C gehalten sind. 10. Device according to claims 6, 7, 8 or 9, characterized in that that both the forming and conveying device as well as the calibration mandrel by cooling are kept at temperatures below 100 0C. 11. Vorrichtung nach den Ansprüchen 6, 7, 8, 9 oder 10, dadurch gekennzeichnet, daß die Form- und Fördereinrichtung aus aus zumindestens zwei endlosen Ketten zusammengefügten Matrizenelementen (3; 20) gebildet ist, die angetrieben sind, umlaufen und sich auf einer begrenzten Strecke zur geschlossenen Form zusammenfügen. 11. Device according to claims 6, 7, 8, 9 or 10, characterized in that that the forming and conveying device is assembled from at least two endless chains Die elements (3; 20) is formed, which are driven, revolve and themselves join together on a limited distance to form a closed form.
DE2316835A 1972-10-19 1973-04-04 Method and device for producing a composite pipe from thermoplastics Expired DE2316835C3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT893272A AT352386B (en) 1972-10-19 1972-10-19 METHOD AND DEVICE FOR THE CONTINUOUS MANUFACTURING OF PLASTIC PIPES COMPOSING AT LEAST TWO LAYERS WITH TRANSVERSAL PROFILES

Publications (3)

Publication Number Publication Date
DE2316835A1 true DE2316835A1 (en) 1974-04-25
DE2316835B2 DE2316835B2 (en) 1979-03-08
DE2316835C3 DE2316835C3 (en) 1979-10-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE2316835A Expired DE2316835C3 (en) 1972-10-19 1973-04-04 Method and device for producing a composite pipe from thermoplastics

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AT (1) AT352386B (en)
BE (1) BE806223A (en)
CH (1) CH556232A (en)
DE (1) DE2316835C3 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542302A1 (en) * 1991-11-13 1993-05-19 CENTRO SVILUPPO SETTORI IMPIEGO S.r.l. Process for manufacturing bodies of polymeric material, comprising a core of foamed material enclosed by outer shell, and device used in said process
EP0636466A2 (en) * 1993-07-26 1995-02-01 UNICOR GmbH Rahn Plastmaschinen Method for producing corrugated tubes from plastic material
EP0897788A1 (en) * 1996-07-23 1999-02-24 BRUGG Rohrsysteme GmbH Method of manufacturing heat insulated pipe
EP2060843A3 (en) * 2007-11-14 2010-01-27 Jarus GmbH Heat insulated pipe and method of its manufacturing
EP3311977A1 (en) * 2016-10-18 2018-04-25 Canlar Boru Profil Plastik Elekt.Ins.Mak.Nak.San. Ve Tic.Ltd.Sti. Plastic pipe machine mandrel cooling and lubricating assembly
RU2785568C2 (en) * 2018-05-07 2022-12-08 Бругг Рор Аг Холдинг Method and device for manufacturing heat-insulated pipeline

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0542302A1 (en) * 1991-11-13 1993-05-19 CENTRO SVILUPPO SETTORI IMPIEGO S.r.l. Process for manufacturing bodies of polymeric material, comprising a core of foamed material enclosed by outer shell, and device used in said process
US5368458A (en) * 1991-11-13 1994-11-29 Centro Sviluppo Settori Impiego S.R.L. Apparatus for manufacturing bodies of polymeric material having a core of foamed material enclosed by an outer shell
US5609803A (en) * 1991-11-13 1997-03-11 Centro Sviluppo Settori Impiego S.R.1. Process for manufacturing bodies of polymeric material, having a core of foamed material enclosed in an outer shell
EP0636466A2 (en) * 1993-07-26 1995-02-01 UNICOR GmbH Rahn Plastmaschinen Method for producing corrugated tubes from plastic material
EP0636466A3 (en) * 1993-07-26 1995-03-29 Unicor Rohrsysteme Gmbh Method and apparatus for producing corrugated tubes from plastic material.
EP0897788A1 (en) * 1996-07-23 1999-02-24 BRUGG Rohrsysteme GmbH Method of manufacturing heat insulated pipe
EP2060843A3 (en) * 2007-11-14 2010-01-27 Jarus GmbH Heat insulated pipe and method of its manufacturing
EP3311977A1 (en) * 2016-10-18 2018-04-25 Canlar Boru Profil Plastik Elekt.Ins.Mak.Nak.San. Ve Tic.Ltd.Sti. Plastic pipe machine mandrel cooling and lubricating assembly
RU2785568C2 (en) * 2018-05-07 2022-12-08 Бругг Рор Аг Холдинг Method and device for manufacturing heat-insulated pipeline

Also Published As

Publication number Publication date
BE806223A (en) 1974-02-15
DE2316835B2 (en) 1979-03-08
ATA893272A (en) 1979-02-15
AT352386B (en) 1979-09-10
CH556232A (en) 1974-11-29
DE2316835C3 (en) 1979-10-31

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