DE1149161B - Pipe jacket heater for screw extrusion for processing thermoplastics - Google Patents
Pipe jacket heater for screw extrusion for processing thermoplasticsInfo
- Publication number
- DE1149161B DE1149161B DEK39457A DEK0039457A DE1149161B DE 1149161 B DE1149161 B DE 1149161B DE K39457 A DEK39457 A DE K39457A DE K0039457 A DEK0039457 A DE K0039457A DE 1149161 B DE1149161 B DE 1149161B
- Authority
- DE
- Germany
- Prior art keywords
- jacket
- tubular
- cooling grooves
- hood
- heating elements
- 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
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
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/834—Cooling
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/832—Heating
-
- 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
Description
Rohrmantelheizkörper für Schneckenstrangpressen zur Verarbeitung thermoplastischer Kunststoffe Die Erfindung bezieht sich auf einen Rohrmantelheizkörper für Schneckenstrangpressen zur Verarbeitung thermoplastischer Kunststoffe in Form eines auf den Preßzylinder aufgeschobenen, gegossenen Metallmantels, der mit schraubenförmig zur Mantelmittellinie verlaufenden Rohrheizelementen und auf seiner zylindrischen Innenwandfläche mit Kühlnuten versehen ist. Tubular jacket heating element for screw extrusion for processing thermoplastic plastics The invention relates to a tubular jacket heating element for screw extrusion presses for processing thermoplastics in shape a cast metal jacket pushed onto the press cylinder, with the helical to the jacket center line extending tubular heating elements and on its cylindrical Inner wall surface is provided with cooling grooves.
Bei einem bekannten Rohrmantelheizkörper ist die Heizelementspirale im Rohrmantel mit Abstand von den Kühlnuten angeordnet. Bei der Herstellung der Rohrmantelheizkörper ist es äußerst schwierig bzw. praktisch unmöglich, die Heizelementspirale während des Gießens des Mantels genau zentrisch zu diesem zu halten. Es ist daher erforderlich, den eigentlichen Rohrmantelkörper stärker auszubilden, um zu vermeiden, daß die Heizelemente zu nahe an die Oberfläche des Rohrmantelkörpers zu liegen kommen. In a known tubular jacket heater, the heating element is spiral arranged in the pipe jacket at a distance from the cooling grooves. In making the With tubular jacket heating elements, it is extremely difficult or practically impossible to use the heating element spiral to keep the mantle exactly centric to this during the casting. It is therefore necessary to make the actual pipe casing body stronger in order to avoid that the heating elements come too close to the surface of the tubular casing body.
Dies hat jedoch den Nachteil, daß der Rohrmantel infolge seiner verhältnismäßig großen Masse eine unerwünschte Trägheit gegenüber Temperaturänderungen besitzt. Eine genaue Nachregelung der Temperatur nimmt daher eine verhältnismäßig lange Zeit in Anspruch. Ferner werden dadurch, daß die Heizelemente nicht genau konzentrisch liegen, im Rohrmantelheizkörper Stellen mit höheren Temperaturen, sogenannte Wärmesäcke, gebildet, die eine lokale Überhitzung des zu verpressenden Kunststoffes und somit Qualitätsschwankungen des Fertigproduktes zur Folge haben. However, this has the disadvantage that the pipe jacket due to its relatively large mass has undesirable inertia to temperature changes. Precise readjustment of the temperature therefore takes a relatively long time in claim. Furthermore, the fact that the heating elements are not exactly concentric are, in the tubular jacket heater areas with higher temperatures, so-called heat bags, formed that a local overheating of the plastic to be pressed and thus Result in fluctuations in the quality of the finished product.
Die Aufgabe der Erfindung besteht darin, die obenerwähnten Nachteile zu vermeiden. Dies wird dadurch erreicht, daß die Grundfläche der Kühlnuten genau auf derselben Zylindermantelfläche liegt, an der die Rohrheizelemente von außen tangieren. Die erfindungsgemäße Ausbildung des Rohrmantelkörpers ermöglicht es, die Heizelemente völlig konzentrisch um die Innenwandfläche des Rohrmantels einzugießen, da die Kernträger der Kühlnuten während des Eingießens gleichzeitig die Träger für die Heizelemente bilden können. Somit wird vermieden, daß es während des Betriebes im Rohrmantelheizkörper zu lokalen Überhitzungen kommt. Auf diese Weise wird eine gleichmäßige Qualität des zu verpressenden Gutes erzielt. Außerdem kann die Masse des Rohrmantelheizkörpers sehr gering gehalten werden. Dadurch ist es möglich, Temperaturschwankungen in kürzester Zeit sehr genau nachzuregeln.. The object of the invention is to overcome the disadvantages mentioned above to avoid. This is achieved in that the base area of the cooling grooves is accurate lies on the same cylinder surface on which the tubular heating elements from the outside affect. The inventive design of the tubular jacket body makes it possible Pour the heating elements completely concentrically around the inner wall surface of the pipe jacket, because the core supports of the cooling grooves are simultaneously the supports for which can form heating elements. This avoids having it during operation local overheating occurs in the tubular jacket heating element. That way becomes a uniform quality of the material to be pressed is achieved. Also, the crowd can of the tubular jacket heating element can be kept very low. This makes it possible for temperature fluctuations can be readjusted very precisely in the shortest possible time.
Die Kühlnuten des erfindungsgemäßen Rohrmantelheizkörpers können in sehr zweckmäßiger Weise mit Kühlluft gespeist werden, indem sie mit ihrem einen, vorzugsweise dem in Förderrichtung der Presse hinteren Ende, an eine durch einen Ventilator gespeiste Kühlluftzuleitung angeschlossen sind. Hierzu kann beispielsweise auf das Lufteintrittsende des Metallmantels eine Luftverteilungshaube axial aufgeschoben sein, die eine Durchtrittsöffnung für den Preßzylinder aufweist. Falls diese Haube an einem radialen Luftzuführungskanal angeschlossen ist, wird zweckmäßig an dessen Eintritt in die Haube eine sich über einen gewissen Umfangswinkel erstreckende, zur Mantelmittellinie konzentrische und radial außerhalb der Kühlnuten des Metallmantels liegende Leitrippe vorgesehen, um zu gewährleisten, daß nicht die dem Eintritt am nächsten liegenden Kühlnuten eine größere Kühlluftmenge erhalten als die übrigen Nuten. The cooling grooves of the tubular jacket heater according to the invention can be fed in a very convenient way with cooling air by using their one, preferably the rear end in the conveying direction of the press, to one through one Fan-fed cooling air supply line are connected. For this purpose, for example an air distribution hood pushed axially onto the air inlet end of the metal jacket be, which has a passage opening for the press cylinder. If that hood is connected to a radial air supply channel, is expedient to its Entry into the hood is an extending over a certain circumferential angle, concentric to the jacket center line and radially outside the cooling grooves of the metal jacket lying guide rib provided to ensure that not the entry on The next cooling grooves receive a larger amount of cooling air than the others Grooves.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. An exemplary embodiment of the invention is shown in the drawing.
Fig. 1 zeigt einen Axialschnitt, Fig. 2 eine Stirnansicht des erfindungsgemäßen Rohrmantelheizkörpers von links. Fig. 1 shows an axial section, Fig. 2 shows an end view of the invention Tubular jacket heater from the left.
Der gegossene Metallmantel 1 des Rohrmantelheizkörpers besitzt zwei getrennte, spiralförmige Rohrheizkörper 2 mit Anschlüssen 3, 4 und 5, 6 am hinteren bzw. vorderen Ende. Ferner ist ein Anschluß 7 für ein Thermoelement für die automatische Temperatursteuerung vorgesehen. Der Metallmantel 1 besitzt an seinem in Förderrichtung der Schneckenstrangpresse hinteren Ende eine Zentrierung 8 für eine Luftverteilungshaube 9. Der Haube 9 wird die Kühlluft über einen radial einmündenden Kanal 10 zugeführt. Im Bereich dieses Zuführungskanals 10 besitzt die Haube 9 eine Leitrippe 11, durch die verhindert wird, daß den dem Kanal 10 am nächsten liegenden Kühlnuten 12 mehr Kühlluft zugeleitet wird als den übrigen Kanälen. Die Kanäle 12 verlaufen im dargestellten Beispiel parallel zur Mantelmittellinie und sind über dem gesamten Umfang des Met als mantels gleichmäßig verteilt; lediglich der unterste Kanal fehlt, weil an dieser Stelle der Anschluß 7 für das Thermoelement sitzt. Wie beide Figuren der Zeichnung erkennen lassen, liegt die Grundfläche 13 sämtlicher Kühlnuten 12, die von der Metallmantel-Innenwandfläche 14 ausgehen, genau auf derselben Zylindermantelfläche, an der die Rohrheizelemente 2 von außen tangieren. Diese Rohrheizelemente werden daher durch die Rippen am Kern der Gießform, durch die die Kühlnutenl2 gebildet werden, genau zur Mittellinie des Metallmantels 1 zentriert. The cast metal jacket 1 of the tubular jacket heater has two separate, spiral-shaped tubular heating elements 2 with connections 3, 4 and 5, 6 at the rear or front end. There is also a connection 7 for a thermocouple for the automatic Temperature control provided. The metal jacket 1 has on its in the conveying direction the rear end of the screw extruder has a centering 8 for an air distribution hood 9. The hood 9 receives the cooling air via a radially opening channel 10 fed. In the area of this feed channel 10, the hood 9 has a guide rib 11 through which is prevented that the cooling grooves 12 lying closest to the channel 10 more Cooling air is supplied than the remaining channels. The channels 12 run in the illustrated Example parallel to the mantle center line and are over the entire circumference of the mead evenly distributed as a jacket; only the lowest channel is missing because on this one Place the connection 7 for the thermocouple is seated. Like both figures in the drawing can be seen, the base 13 of all cooling grooves 12 is from the metal jacket inner wall surface 14 go out, exactly on the same cylinder surface on which the tubular heating elements 2 tangent from the outside. These tubular heating elements are therefore through the ribs on the core of the mold, through which the cooling grooves are formed, exactly to the center line of the Metal jacket 1 centered.
An Stelle dessen können die Kühlnuten 12 auch schräg zur Mittellinie des Metallmantels 1 oder auch spiralförmig verlaufen. Bei geradem Verlauf sind zur Zentrierung der Rohrheizelemente 2 naturgemäß mindestens drei Kühlnuten bzw. drei Leisten am Kern des Gußmodells erforderlich. Um das Aufschieben des Metallmantels 1 auf den Zylinder der Schneckenstrangpresse zu erleichtern, kann die Metallmantel-Innenwandfläche 14 gegebenenfalls leicht konisch ausgebildet werden. Instead of this, the cooling grooves 12 can also be inclined to the center line of the metal shell 1 or run in a spiral. In a straight line are for Centering of the tubular heating elements 2 naturally at least three cooling grooves or three Moldings required at the core of the casting model. About pushing on the metal jacket 1 to facilitate the barrel of the screw extruder, the metal jacket inner wall surface can 14 may be designed to be slightly conical.
Die Haube 9 besitzt an ihrem hinteren Ende eine Durchtrittsöffnung 15 für den Zylinder der Schnekkenstrangpresse, auf den der Metallmantell aufgeschoben werden soll. Die öffnung 15 hat zweckmäßig genau den gleichen Durchmesser wie die Metallmantel-Innenwandfläche 14, um eine möglichst weitgehende Luftdichtigkeit zwischen der Haube 9 und dem Pressenzylinder zu erzielen. The hood 9 has a passage opening at its rear end 15 for the cylinder of the screw extruder on which the metal jacket is pushed shall be. The opening 15 expediently has exactly the same diameter as that Metal jacket inner wall surface 14 to achieve the greatest possible airtightness between to achieve the hood 9 and the press cylinder.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK39457A DE1149161B (en) | 1959-12-18 | 1959-12-18 | Pipe jacket heater for screw extrusion for processing thermoplastics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEK39457A DE1149161B (en) | 1959-12-18 | 1959-12-18 | Pipe jacket heater for screw extrusion for processing thermoplastics |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1149161B true DE1149161B (en) | 1963-05-22 |
Family
ID=7221722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEK39457A Pending DE1149161B (en) | 1959-12-18 | 1959-12-18 | Pipe jacket heater for screw extrusion for processing thermoplastics |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1149161B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4763722A (en) * | 1986-04-18 | 1988-08-16 | Gaetano Piazzola | Modular element heat exchanger, particularly for extrusion cylinders, injection molding machines, drawing machines and the like plastics processing machines |
US4828020A (en) * | 1986-08-15 | 1989-05-09 | Crompton & Knowles Corporation | Internal finned heater-cooler for an extruder barrel |
EP0396030A2 (en) * | 1989-05-05 | 1990-11-07 | Karl Hehl | Heating apparatus for a machine for working plastic materials |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2541201A (en) * | 1948-08-28 | 1951-02-13 | Nat Rubber Machinery Co | Method of extrusion |
US2774107A (en) * | 1954-10-15 | 1956-12-18 | Standard Machinery Company | Extrusion apparatus |
-
1959
- 1959-12-18 DE DEK39457A patent/DE1149161B/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2541201A (en) * | 1948-08-28 | 1951-02-13 | Nat Rubber Machinery Co | Method of extrusion |
US2774107A (en) * | 1954-10-15 | 1956-12-18 | Standard Machinery Company | Extrusion apparatus |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4763722A (en) * | 1986-04-18 | 1988-08-16 | Gaetano Piazzola | Modular element heat exchanger, particularly for extrusion cylinders, injection molding machines, drawing machines and the like plastics processing machines |
US4828020A (en) * | 1986-08-15 | 1989-05-09 | Crompton & Knowles Corporation | Internal finned heater-cooler for an extruder barrel |
EP0396030A2 (en) * | 1989-05-05 | 1990-11-07 | Karl Hehl | Heating apparatus for a machine for working plastic materials |
EP0396030A3 (en) * | 1989-05-05 | 1991-12-04 | Karl Hehl | Heating apparatus for a machine for working plastic materials |
US5157241A (en) * | 1989-05-05 | 1992-10-20 | Karl Hehl | Temperature control device provided in a plastic-processing machine |
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