DE1148376B - Extrusion head for the production of plastic pipes - Google Patents

Extrusion head for the production of plastic pipes

Info

Publication number
DE1148376B
DE1148376B DEW29067A DEW0029067A DE1148376B DE 1148376 B DE1148376 B DE 1148376B DE W29067 A DEW29067 A DE W29067A DE W0029067 A DEW0029067 A DE W0029067A DE 1148376 B DE1148376 B DE 1148376B
Authority
DE
Germany
Prior art keywords
tube
extrusion head
plastic
discharge tube
production
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DEW29067A
Other languages
German (de)
Inventor
John Jennings Lainson
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.)
Western Plastics Corp
Original Assignee
Western Plastics Corp
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 Western Plastics Corp filed Critical Western Plastics Corp
Priority to DEW29067A priority Critical patent/DE1148376B/en
Priority to FR849664A priority patent/FR1277683A/en
Publication of DE1148376B publication Critical patent/DE1148376B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—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
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins
    • 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
    • B29L2023/22—Tubes or pipes, i.e. rigid

Description

Strangpreßkopf zur Herstellung von Kunststoffrohren Die Erfindung betrifft einen Strangpreßkopf zur Herstellung von Kunststoffrohren, insbesondere solchen aus Polyäthylen. Extrusion head for the production of plastic pipes The invention relates to an extrusion head for the production of plastic pipes, in particular those made of polyethylene.

Zweck der Erfindung ist es, die Zugfest.gkeit von Kunststoffrohren sowohl bei Raumtemp3ratur als auch bei höheren Temperaturen von etwl 1500 C zu erhöhen, so daß die Rohre höhere Drückt aushalten. The purpose of the invention is to improve the tensile strength of plastic pipes to increase both at room temperature and at higher temperatures of around 1500 C, so that the pipes can withstand higher pressures.

Ferner zielt oie Erfindung darauf ab, Kunststoffrohre von höherer Widerstandsfähigkeit gegen den Angriff durch Chemikalien und gegen das Auftreten von Spannungsrissen in der äußeren Oberfläche herzustellen. Schließlich soll es ermöglicht werden, Kunststoffrolare zu erzeugen, deren Werkstoff sich nicht wieder einschmelzen und zu neuen Kunststofferzeugnissen verarbeiten läßt. Furthermore, the invention aims at making plastic pipes of higher Resistance to chemical attack and to the occurrence of stress cracks in the outer surface. After all, it should be made possible to produce plastic polar, the material of which is not again melted down and processed into new plastic products.

Es s ist bekannt, daß Polyolefine, wie Polyäthylen, derartige Eigenschaften durch Vernetzung erlangen -und daß eine solche Vernetzung durch Bestrahlen mit ultraviolettem Licht erreicht werden kann. Diese Vernetzung beruht darauf, daß die Energie des ultravioletten Lichtes die Befreiung der an die Kohlenstoffkette des Polyäthylenmoleküls gebundenen Wasserstoffatome von der Bindung an die Kohlenstoffatome bewirkt, so daß eine »offene Bindung« entsteht. Die Polyäthylenmoleküle in linearer oder semilinearer Anordnung sind also von Kohlenstoffatom an Kohlenstoffatom gebunden, wie es Fig. 1 der Zeichnung zeigt. It is known that polyolefins such as polyethylene have such properties obtain by crosslinking - and that such crosslinking by irradiation with ultraviolet Light can be achieved. This networking is based on the fact that the energy of the ultraviolet light releases the carbon chain of the polyethylene molecule bonded hydrogen atoms from bonding to the carbon atoms causes so that an "open bond" arises. The polyethylene molecules in linear or semilinear Arrangements are therefore bonded from carbon atom to carbon atom, as shown in Fig. 1 of the drawing shows.

Es ist bekannt, einen frisch ausgepreßten Polyäthylenfilm in kontinuierlichem Verfahren bei Temperaturen von 150 bis 3250 C mit Stickoxyd zu behandeln und dabei gleichzeitig mit ultraviolettem Licht zu bestrahlen, um der Filmoberfläche ein besseres Haftvermögen für Druckfarben zu verleihen. It is known to have a freshly squeezed polyethylene film in continuous Process to treat at temperatures of 150 to 3250 C with nitrogen oxide and thereby at the same time irradiate with ultraviolet light to make the film surface a better one To give adhesion for printing inks.

Es war jedoch noch keine Vorrichtung bekannt, um Kunststoffrohre, besonders solche aus Polyäthylen, während des Preßvorganges mit ultravioletten Strahlen zu bestrahlen, um eine Vernetzung des Kunststoffes herbeizuführen. However, no device was yet known for making plastic pipes, especially those made of polyethylene, during the pressing process with ultraviolet rays to irradiate to bring about a crosslinking of the plastic.

Der erfindungsgemäße Strangpreßkopf zur Herstellung von Kunststoffrohren, insbesondere solchen aus Polyäthylen, ist dadurch gekennzeichnet, daß am Dorn der Preßdüse eine ultraviolettes Licht aussendende Entladungsröhre angeordnet ist, die im Inneren des herzustellenden Rohres liegt. The extrusion head according to the invention for the production of plastic pipes, in particular those made of polyethylene, is characterized in that the mandrel Compression nozzle an ultraviolet light emitting discharge tube is arranged, which is inside the pipe to be produced.

Nach einer bevorzugten Ausführungsform sitzt die Entladungsröhre an einer Stelle im ausgepreßten Rohr, an der dieses noch weich ist. According to a preferred embodiment, the discharge tube is seated at a point in the pressed pipe where it is still soft.

Die Wellenlänge der von der Entladungsröhre abgegebenen Strahlung liegt vorzugsweise im Bereich von etwa 900 bis 3000 Ä, und die Intensität der Strahlung soll mindestens 40 000 Mikrowatt je Quadratzentimeter der Kunststoffoberfläche betragen. The wavelength of the radiation emitted by the discharge tube is preferably in the range of about 900 to 3000 Å, and the intensity of the radiation should be at least 40,000 microwatts per square centimeter of the plastic surface.

Zur Erzielung der besten Ergebnisse ist es wünschenswert, daß etwa 90e/o derStrahlungeineWellenlänge von 2537 A haben. For best results it is desirable that about 90e / o of the radiation have a wavelength of 2537 A.

Fig. 1 ist das Schaubild eines Polyäthylenmoleküls und zeigt die Vernetzung als Folge der ultravioletten Strahlung; Fig. 2 zeigt den Strangpreßkopf gemäß der Erfindung. Fig. 1 is a diagram of a polyethylene molecule showing the Crosslinking as a result of ultraviolet radiation; Fig. 2 shows the extrusion head according to the invention.

Die Fig. 2 zeigt eine Strangpreßform 10 an sich bekannter Bauart zum Strangpressen des Kunststoffrohres 11. Der mit Wasser gefüllte Dorn 12 ist starr gegenüber der Strangpreßform 10 befestigt und ragt aus ihr heraus. Erfindungsgemäß trägt das linke Ende dieses Dorns einen Sockel 13 zur Aufnahme der Röhre 14 zur Erzeugung ultravioletter Strahlung. Fig. 2 shows an extrusion mold 10 of known type for extrusion of the plastic pipe 11. The mandrel 12 filled with water is rigid attached to the extrusion mold 10 and protrudes from it. According to the invention the left end of this mandrel carries a base 13 for receiving the tube 14 to Generation of ultraviolet radiation.

Der Kunststoff wird in an sich bekannter Weise durch die Einlaßrohre 15 und 16 der Strangpreßform 10 eingeführt. Das Material wird zusammengefügt und durch die Austrittsöffnung 17 zu einem Rohr gepreßt, das sich in der Zeichnung von rechts nach links fortbewegt. The plastic is in a manner known per se through the inlet pipes 15 and 16 of the extrusion mold 10 is introduced. The material is put together and pressed through the outlet opening 17 to form a tube, which is shown in the drawing of moved right to left.

Während der ersten Augenblicke nach dem Verlassen der Austrittsöffnung 17 ist der Kunststoff verformbar und weich. Anschließend wird er in bekannter Weise über einen mit Wasser gefüllten Dorn 12 geführt, so daß das Material abgekühlt wird und ein starres Rohr bildet. Nach dem Abkühlen und vor dem abschließenden Härten läuft das Rohr erfindungsgemäß an der Ultraviolettröhre 14 vorbei und wird so von innen her der von der Röhre 14 ausgestrahlten Energie ausgesetzt. During the first few moments after leaving the outlet opening 17, the plastic is malleable and soft. Then he is in a familiar manner guided over a mandrel 12 filled with water so that the material is cooled and forms a rigid tube. After cooling and before final hardening According to the invention, the tube runs past the ultraviolet tube 14 and is thus of internally exposed to the energy radiated from the tube 14.

Es dürfen natürlich keine Kunststoffe zum Strangpressen verwendet werden, die z. : B. mit Hilfe von Ruß oder anderen Mitteln undurchsichtig gemacht wurden. Der Kunststoff muß vielmehr fjir die ultraviolette Strahlung hinreichend durchlässig sein, damit er die eingestrahlte Energie in seiner ganzen Masse absorbieren kann und die gewünschte Vernetzung erfolgen kann. Of course, no plastics may be used for extrusion be that z. : B. made opaque with the help of soot or other means became. Rather, the plastic must be sufficient for the ultraviolet radiation be permeable so that it can absorb the radiated energy in its entire mass and the desired networking can take place.

In der Zeichnung-bezeichnet Ila-.ire innere Schicht aus reinem Kunststoff und 11 b- eine äußere Schicht aus undurchsichtigem Kanststoff. Da die innere Schicht 11 a ultraviolette Energie durchläßt und absorbiert, wird die angestrebte Wirkung erreicht. Natürlich kann das stranggepreßte Rohr auch vollständig aus lichtdurchlässigem Kunststoff bestehen. In the drawing Ila -ire denotes the inner layer made of pure plastic and 11b- an outer layer of opaque plastic. Because the inner layer 11 a transmitting and absorbing ultraviolet energy becomes the desired effect achieved. Of course, the extruded tube can also be made entirely of translucent Made of plastic.

Die Röhre 14 zur Erzeugung der ultravioletten Strahlung ist im allgemeinen von üblicher Bauart. The tube 14 for generating the ultraviolet radiation is generally of the usual design.

Dennoch sind bestimmte Veränderungen erforderlich, damit sie in einer Größe hergestellt werden kann, die ihre Verwendung innerhalb des Kunststoffrohres 11 ermöglicht, und damit sie auf dem Sockel 13 befestigt werden kann. Die Röhre hat eine kalte Kathode und ist mit Argon und Quecksilber bei einem Druck von 15 mm Quecksilbersäule gefüllt. Die Röhre enthält zwei Elektroden 20 und 21, die einander gegenüber in der Längsachse der Röhrenhülle 22 angebracht sind, so daß die zwischen ihnen sich bildende positive Säule nicht mehr als notwendig durch den Sockel 13 oder eine andere die Röhre tragende Konstruktion abgeschirmt wird. Die Elektrode 20 besitzt eine Klemme 23 und die Elektrode 21 eine Klemme 24 als Verbindung nach außen. Der Leiter 25 verbindet die Elekkode20 mit der Klemme24. Dieser Leiter liegt in der Röhre, und zwar spiralförmig an der inneren Wand der Röhre.Nonetheless, certain changes are required to turn them into a Size can be made that their use within the plastic pipe 11 allows, and so that it can be attached to the base 13. The tube has a cold cathode and is argon and mercury at a pressure of 15 mm of mercury filled. The tube contains two electrodes 20 and 21 that face each other are mounted opposite in the longitudinal axis of the tubular casing 22, so that the between no more positive pillar than necessary through the base 13 or some other structure supporting the tube is shielded. The electrode 20 has a terminal 23 and the electrode 21 has a terminal 24 as a connection to Outside. The conductor 25 connects the electrode 20 with the terminal 24. This ladder lies in the tube, spiraling on the inner wall of the tube.

Die Leiter 27 und 28 sind mit den Klemmen 23 und 24 verbunden, so daß die Röhre 14 durch eine von der Form 10 entfernt liegende äußere Quelle gespeist werden kann. Die Leiter 27 und 28 verlaufen in einer metallischen Führung 29, die eine Schutzhülle für diese Leiter bildet. Die Führung 29 liegt in der zentralen Bohrung der Form 10, die durch den Schraubverschluß 30 und den Formdorn 31 begrenzt wird. Die zentrale Bohrung der Form 10 enthält außerdem ein dünnes Metallrohr 32, das aus der Austrittsöffnung 17 derart herausragt, daß es mit einigem Abstand von der Öffnung 17 den mit Wasser gefüllten Dorn 12 trägt. Der mit kaltem Wasser gefüllte Dorn 12 besteht aus zwei zylindrischen Teilen 33 und 34. The conductors 27 and 28 are connected to the terminals 23 and 24, see above that the tube 14 is fed by an external source remote from the mold 10 can be. The conductors 27 and 28 run in a metallic guide 29 which forms a protective cover for these conductors. The guide 29 is in the central Bore of the mold 10, which is limited by the screw cap 30 and the mandrel 31 will. The central bore of the mold 10 also contains a thin metal tube 32, which protrudes from the outlet opening 17 in such a way that it is at some distance from the opening 17 carries the mandrel 12 filled with water. The one filled with cold water Mandrel 12 consists of two cylindrical parts 33 and 34.

Der zylindrische Teil 34 hat gegenüber dem Teil 33 einen kleineren Durchmesser, so daß der Teil 34 in das linke Ende des Rohres 32 eingepaßt werden kann. Das Rohr 32 und der mit kaltem Wasser gefüllte Dorn 12 sind starr miteinander verbunden, so daß keine gegenseitige Verschiebung dazwischen möglich ist.The cylindrical part 34 is smaller than the part 33 Diameter so that the part 34 can be fitted into the left end of the tube 32 can. The tube 32 and the mandrel 12 filled with cold water are rigid with one another connected so that no mutual displacement between them is possible.

Der Teil 33 des mit kaltem Wasser gefüllten Dorns 12 hat eine ringförmige Rippe 37 und darüber hinausragend einen Ring 38. Die Wand 39 liegt an der Rippe 37 und bildet so eine Begrenzungswand des mit kaltem Wasser gefüllten Dorns 12. Außerdem bildet die Wand 39 die Aufsatztläche des Sockels 13. The part 33 of the mandrel 12 filled with cold water has an annular shape Rib 37 and a ring 38 protruding beyond it. The wall 39 rests on the rib 37 and thus forms a boundary wall of the mandrel 12 which is filled with cold water. In addition, the wall 39 forms the attachment surface of the base 13.

Während des Strangpressens wird durch das Einlaßrohr 40 kaltes Wasser in die Kammer 41 des Dorns 12 geleitet. Die Kammer 41 ist demnach mit kaltem Wasser gefüllt, das frei fließen kann, je nachdem, wieviel Wasser der Kammer 41 durch das Auslaßrohr 42 wieder entzogen wird. Ein kontinuierlicher Wasserstrom durch das Rohr 40, die Kammer 41 und das Rohr 42 ermöglicht eine kontinuierliche Kühlung des Kunststoffrohres während des Strangpressens. Cold water is supplied through the inlet pipe 40 during extrusion passed into the chamber 41 of the mandrel 12. The chamber 41 is therefore with cold water filled, which can flow freely, depending on how much water in the chamber 41 through the Outlet pipe 42 is withdrawn again. A continuous flow of water through the pipe 40, the chamber 41 and the tube 42 enable continuous cooling of the plastic tube during extrusion.

Die Sockelhülse 50 ist mit dem Ring 37, der über die Begrenzungswand 39 des mit kaltem Wasser gefüllten Dorns hinausragt, starr verbunden. Innerhalb der Hülse 50 befindet sich ein Sitz aus Isoliermaterial 51. Dieser Sitz 50 hat eine Bohrung oder Vertiefung, damit das rechte Klemmende der Röhre 14 zur Befestigung in der Arbeitsstellung eingeführt werden kann. Da die Röhre 14 durch das Sekundärklemmenpaar eines Transformators mit einer Wechselstromspannung von 500 V bei 20 mA betrieben wird, müssen die Leitungen 27 und 28 sowie die Röhre 14 ausreichend gegenüber den angrenzenden Metallteilen isoliert sein, damit kein Erdschluß auftreten kann. The base sleeve 50 is with the ring 37, which over the boundary wall 39 of the thorn, which is filled with cold water, protrudes, rigidly connected. Within the sleeve 50 is a seat made of insulating material 51. This seat 50 has a Bore or recess so that the right clamping end of the tube 14 for attachment can be introduced in the working position. Since the tube 14 through the secondary clamp pair a transformer operated with an AC voltage of 500 V at 20 mA is, the lines 27 and 28 and the tube 14 must be sufficient against the adjacent metal parts must be insulated so that no earth fault can occur.

Wenn das Rohr 11 mit der in der Kunststoffproduktion gebräuchlichen Geschwindigkeit stranggepreßt und auf dem hier beschriebenen Weg bestrahlt worden ist, erhöht sich die Zugfestigkeit des Rohres um etwa 25 0/o. Dieses Anwachsen der Zugfestigkeit ermöglicht gleichzeitig eine Erhöhung des Druckes im Rohr. Der bestrahlte Kunststoff wird widerstandsfähiger gegenüber Chemikalien und Spannungsrissen auf der Oberfläche. Die Vernetzung des molekularen Aufbaues des Kunststoffes verhindert auch das Wiedereinschmelzen, und der bestrahlte Kunststoff kann deshalb nicht wieder verarbeitet werden. If the tube 11 is used in the plastic production Extruded speed and irradiated in the way described here is, the tensile strength of the pipe increases by about 25%. This growth of the Tensile strength enables the pressure in the pipe to be increased at the same time. The irradiated Plastic becomes more resistant to chemicals and stress cracking the surface. The cross-linking of the molecular structure of the plastic is prevented also remelting, and the irradiated plastic can therefore not be re-melted are processed.

Claims (4)

PATENTANSPRÜCHE: 1. Strangpreßkopf zur Herstellung von Kunststoffrohren, insbesondere solchen aus Polyäthylen, dadurch gekennzeichnet, daß am Dorn der Preßdüse eine ultraviolettes Licht strahlende Entladungsröhre angeordnet ist, die im Inneren des herzustellenden Rohres liegt. PATENT CLAIMS: 1. Extrusion head for the production of plastic pipes, in particular those made of polyethylene, characterized in that on the mandrel of the press nozzle an ultraviolet light emitting discharge tube is arranged inside of the pipe to be produced lies. 2. Strangpreßkopf nach Anspruch 1, dadurch gekennzeichnet, daß die Entladungsröhre an einer Stelle im ausgepreßten Rohr sitzt, an der dieses noch weich ist. 2. extrusion head according to claim 1, characterized in that the Discharge tube sits at a point in the pressed tube where it is still soft is. 3. Strangpreßkopf nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Wellenlänge der von der Entladungsröhre abgegebenen Strahlung etwa 900 bis 3000 A beträgt. 3. extrusion head according to claim 1 and 2, characterized in that that the wavelength of the radiation emitted by the discharge tube is about 900 to 3000 A. 4. Strangpreßkopf nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die von der Entladungsröhre abgegebenen Strahlung eine Intensität von mindestens 40000 Mikrowatt pro Quadratzentimeter der bestrahlten Kunststoff oberfläche aufweist. 4. extrusion head according to claim 1 to 3, characterized in that that the radiation emitted by the discharge tube has an intensity of at least 40,000 microwatts per square centimeter of the irradiated plastic surface. In Betracht gezogene Druckschriften: Britische Patentschrift Nr. 848414; USA.-Patentschriften Nr. 2 859 476, 2 720 680, 2715077. Documents considered: British Patent No. 848414; U.S. Patent Nos. 2,859,476, 2,720,680, 2715077.
DEW29067A 1960-12-12 1960-12-12 Extrusion head for the production of plastic pipes Pending DE1148376B (en)

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DEW29067A DE1148376B (en) 1960-12-12 1960-12-12 Extrusion head for the production of plastic pipes
FR849664A FR1277683A (en) 1960-12-12 1961-01-13 Process of simultaneous extrusion and irradiation of plastics, apparatus used and products obtained

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Application Number Priority Date Filing Date Title
DEW29067A DE1148376B (en) 1960-12-12 1960-12-12 Extrusion head for the production of plastic pipes
FR849664A FR1277683A (en) 1960-12-12 1961-01-13 Process of simultaneous extrusion and irradiation of plastics, apparatus used and products obtained

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1629530B1 (en) * 1966-03-08 1972-05-25 Mannesmann Ag Method for manufacturing a composite pipe consisting of a steel pipe with outer plastic layers
FR2216097A1 (en) * 1973-02-07 1974-08-30 Pont A Mousson

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2462259A1 (en) * 1979-08-03 1981-02-13 Seperef METHOD AND DEVICE FOR THE CONTINUOUS PRODUCTION OF TUBULAR STRUCTURES OF PLASTIC MATERIAL

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2715077A (en) * 1952-11-29 1955-08-09 Du Pont Process for treating polyethylene structures
US2720680A (en) * 1952-02-29 1955-10-18 Milo R Gerow Methods and machines for producing tubing and sheeting
US2859476A (en) * 1955-08-01 1958-11-11 Western Plastics Corp Extrusion apparatus
GB848414A (en) * 1955-12-20 1960-09-14 Gerald Oster Improvements in or relating to the cross-linking of hydrocarbons

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720680A (en) * 1952-02-29 1955-10-18 Milo R Gerow Methods and machines for producing tubing and sheeting
US2715077A (en) * 1952-11-29 1955-08-09 Du Pont Process for treating polyethylene structures
US2859476A (en) * 1955-08-01 1958-11-11 Western Plastics Corp Extrusion apparatus
GB848414A (en) * 1955-12-20 1960-09-14 Gerald Oster Improvements in or relating to the cross-linking of hydrocarbons

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1629530B1 (en) * 1966-03-08 1972-05-25 Mannesmann Ag Method for manufacturing a composite pipe consisting of a steel pipe with outer plastic layers
FR2216097A1 (en) * 1973-02-07 1974-08-30 Pont A Mousson

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FR1277683A (en) 1961-12-01

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