DE3335718A1 - Internal stabiliser for plastics tubular films - Google Patents

Internal stabiliser for plastics tubular films

Info

Publication number
DE3335718A1
DE3335718A1 DE19833335718 DE3335718A DE3335718A1 DE 3335718 A1 DE3335718 A1 DE 3335718A1 DE 19833335718 DE19833335718 DE 19833335718 DE 3335718 A DE3335718 A DE 3335718A DE 3335718 A1 DE3335718 A1 DE 3335718A1
Authority
DE
Germany
Prior art keywords
blow head
internal stabilizer
internal
guided
stabilizer according
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.)
Ceased
Application number
DE19833335718
Other languages
German (de)
Inventor
Veit-Holger Dr.-Ing. 8903 Bobingen Karl
Franz Ing.(grad.) 8900 Augsburg Mahler
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.)
Alpine AG
Original Assignee
Alpine AG
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 Alpine AG filed Critical Alpine AG
Priority to DE19833335718 priority Critical patent/DE3335718A1/en
Publication of DE3335718A1 publication Critical patent/DE3335718A1/en
Ceased 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
    • 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
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/9125—Cooling of hollow articles of tubular films internally
    • 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
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

An internal stabiliser for plastics tubular films is described which is connected downstream of a blowing head having an annular die and connected to a screw extruder and is firmly connected to said blowing head. Here, the internal stabiliser determines a surface extending coaxially to the annular die in the form of a cylinder or acute cone, along which the extruded tubular film is guided. This surface is formed by individual elements movable during the extrusion process by means of an externally actuatable adjustment device. These elements are segments made of an elastic material which are axially aligned with their longitudinal extent and contact as tangential surfaces an imaginary rotational body coaxial to the blowing head and the ends of which can be displaced relative to one another in the direction of the blowing head axis.

Description

II. BeschreibungII. Description

Patent(anmeldung P) 33 31 945 beschreibt einen Innenstabilisator für Kunststoffschlauchfolien, der einem mit einer Schnekkenstrangpresse verbundenen Blaskopf mit Ringspaltdüse nachgeschaltet ist. Dieser Innenstabilisator bestimmt eine koaxial zur Ringspaltdüse sich erstreckende Fläche in Form eines Zylinders oder schlanken Konus, an der die extrudierte Schlauchfolie entlanggeführt wird und die durch einzelne, während des Extrudiervorganges mit einer von außen betätigbaren Verstellvorrichtung bewegbare Elemente einer eine zylindrische oder konische Hüllfläche bestimmenden Anordnung gebildet wird. Patent (registration P) 33 31 945 describes an internal stabilizer for tubular plastic films, the one connected to a screw extruder Downstream blow head with annular gap nozzle. This indoor stabilizer determines a surface in the form of a cylinder extending coaxially to the annular gap nozzle or slim cone along which the extruded tubular film is guided and which can be actuated from the outside by individual ones during the extrusion process Adjusting device movable elements of a cylindrical or conical envelope surface determining arrangement is formed.

Die dort näher beschriebene Ausführung ist für die Mehrzahl der Anwendungsfälle geeignet, da in der Regel nur ein verhältnismäßig kleiner Verstellbereich der bewegbaren Elemente erforderlich ist. The design described in more detail there is for the majority of applications suitable because usually only a relatively small adjustment range of the movable ones Elements is required.

Die vorliegende Erfindung schafft nun die Möglichkeit, einen größeren Verstellbereich mit den bewegbaren Elementen zu beherrschen, aber auch einen weiteren Durchmesserbereich der Ringspaltdüse des Blaskopfs, insbesondere nach kleinen Durchmessern, zu erfassen. The present invention now creates the possibility of a larger To master the adjustment range with the movable elements, but also another Diameter range of the annular gap nozzle of the blow head, especially after small diameters, capture.

Dies wird dadurch erreicht, daß die bewegbaren Elemente als Lamellen aus einem elastischen Material, vorzugsweise Federstahl, ausgebildet werden, die mit ihrer Längserstreckung in Richtung der Blaskopfachse verlaufen und die einen gedachten, koaxialen Rotationskörper als Tangentenflächen berühren. Die Enden der Lamellen sind dabei relativ zueinander in Richtung der Blaskopfachse verschiebbar. Jede Lamelle ist also als Stab mit Knickbelastung anzusehen, der in Abhängigkeit von der Lage der Lamellenenden mehr oder weniger weit aus seiner Ausgangslage heraus in radialer Richtung zur Blaskopfachse ausweicht. This is achieved in that the movable elements are designed as slats made of an elastic material, preferably spring steel, are formed, the run with their longitudinal extension in the direction of the blow head axis and the one touch imaginary, coaxial bodies of revolution as tangent surfaces. The ends of the Lamellae can be displaced relative to one another in the direction of the axis of the blow head. Each lamella is therefore to be regarded as a rod with buckling load that is dependent on from the position of the lamella ends more or less far from its starting position deviates in the radial direction to the blow head axis.

Zweckmäßig ist es, die Enden der Lamellen oben und unten in einen Ring einzuspannen, wobei der untere Ring bezüglich der Blaskopfachse feststehend und der obere Ring mit Hilfe einer außerhalb des Blaskopfes betätigbaren Verstelleinrichtung in Achsrichtung verschiebbar angeordnet wird. Um zu gewährleisten, daß die Lamellen stets nach außen ausweichen, sollten die Lamellen leicht vorgespannt sein, so daß sie bereits in der Ausgangslage etwas nach außen gekrümmt sind. It is useful to put the ends of the slats in at the top and bottom a Clamp the ring, with the lower ring stationary with respect to the blow head axis and the upper ring with the aid of an adjusting device which can be actuated outside of the blow head is arranged displaceably in the axial direction. To ensure that the slats always evade outwards, the slats should be slightly pretensioned so that they are already slightly curved outwards in the starting position.

Zur Verstellung des verschiebbaren Ringes kann eine Gewindestange verwendet werden, die innerhalb eines fest mit dem Blaskopf verbundenen koaxialen Rohres drehbar gelagert wird, und mit der eine nur axial verschiebbare Gewindebuchse zusammenwirkt, die kraftschlüssig. z. B. über einen in einem Längsschlitz im zentralen Rohr geführten Mitnehmerstift, mit dem verschiebbaren Ring verbunden ist. Mit dieser Verstelleinrichtung läßt sich das radiale Ausweichen der Lamellen sehr feinfühlig einstellen, so daß ein genaues Anpassen an den sich jeweils einstellenden Durchmesser des nach dem Austritt aus der Ringspaltdüse gebildeten Folienhalses der Schlauchfolie möglich ist.Zur Anpassung an die Länge des Folienhalses können mehrere gleichartig ausgebildete und gemeinsam von der Verstelleinrichtung betätigte axial aufeinanderfolgende Lamellenanordnungen vorgesehen werden. Dabei kann es zweckmäßig sein, wenn der untere Ring jeder Lamellenanordnung axial verstellbar ist, so daß der von der gesamten Anordnung bestimmten Hüllfläche eine zylindrische oder konische Form entsprechend der Form des Folienhalses gegeben werden kann. Obwohl die von den Lamellen gebildete Fläche einen kleinen Gleitwiderstand für die daran entlanggeführte Schlauchfolie aufweist, kann es vorteilhaft sein, wenn dieser Gleitwiderstand noch zusätzlich dadurch verringert wird, daß die Lamellen mit einer das Anhaften der Folie verhindernden Beschichtung versehen werden.A threaded rod can be used to adjust the displaceable ring are used within a coaxial fixed to the die Tube is rotatably mounted, and with the only axially displaceable threaded bushing cooperates that frictionally. z. B. via one in a longitudinal slot in the central Tube guided driving pin, connected to the sliding ring. With this Adjustment device allows the radial deflection of the slats to be very sensitive adjust so that an exact adaptation to the diameter that is being set in each case of the film neck of the tubular film formed after exiting the annular gap nozzle To adapt to the length of the film neck, several of the same type can be used trained and jointly actuated by the adjusting device axially successive Lamella arrangements are provided. It can be useful if the lower Ring of each lamella arrangement is axially adjustable so that of the entire Arrangement certain envelope surface a cylindrical or conical shape accordingly the shape of the film neck can be given. Although the one formed by the slats There is a small amount of sliding resistance for the tubular film that runs along it has, it can be advantageous if this sliding resistance is also added is reduced by the fact that the lamellae with a preventing the sticking of the film Coating are provided.

Bewährthatsich hierbei vor allem eine Beschichtung mit Polytetrafluoräthylen.A coating with polytetrafluoroethylene has proven particularly useful here.

In der Zeichnung ist ein einfaches Ausführungsbeispiel des erfindungsgemäßen Innenstabilisators dargestellt.In the drawing is a simple embodiment of the invention Internal stabilizer shown.

Fig. 1 zeigt den Längsschnitt, Fig. 2 einen Querschnitt, wobei jeweils die linke Seite der Figuren den Innenstabilisator in der Stellung für den kleinsten, die rechte Seite für den größten, mit der dargestellten Anordnung erfaßbaren Durchmesser der Ringspaltdüse wiedergibt.Fig. 1 shows the longitudinal section, Fig. 2 shows a cross section, in each case the left side of the figures the internal stabilizer in the position for the smallest, the right-hand side for the largest diameter that can be detected with the arrangement shown the annular gap nozzle reproduces.

Koaxial zur Ringspaltdüse 1 des Blaskopfes 2 ist das Rohr 3 über Flansch 4 mit den Schrauben 5 am Blaskopf 2 befestigt.The pipe 3 is coaxial with the annular gap nozzle 1 of the blow head 2 via a flange 4 attached to the blow head 2 with the screws 5.

Innerhalb des Rohres 3 ist die Gewindestange 6 im Wälzlager 7 drehbar gelagert und arbeitet mit der Gewindebuchse 8 zusammen.The threaded rod 6 is rotatable in the roller bearing 7 within the tube 3 stored and works with the threaded bush 8 together.

In die Gewindebuchse 8 sind Mitnehmerstifte 9 eingesetzt, die in Längsschlitzen 10 im Rohr 3 geführt werden und kraftschlüssig mit dem verschiebbaren Ring 11 in Verbindung stehen. In Ring 11 und in Ring 12, dessen axiale Lage durch den mit Rohr 3 verbundenen Flansch 13 bestimmt wird, sind die Lamellen 14 aus dünnem Federstahl eingespannt, wobei die Einspannflächen der Ringe 11 und 12 leicht kegelförmig ausgebildet sind, so daß die Lamellen 14 in Ausgangslage, d. h. bei maximalem Abstand der Ringe 11 und 12, bereits etwas nach außen gekrümmt sind (Fig. 1, linke Seite). Die Gewindestange 6 ist durch den Blaskopf 2 hindurchgeführt und kann außerhalb des Blaskopfes 2 (in hier nicht dargestellter Weise) betätigt werden, z. B. durch eine Handkurbel. Bei langem Folienhais der Schlauchfolie 15 können mehrere Anordnungen nach Fig. 1 am Rohr 3 angeordnet werden und gemeinsam mit der Gewindestange 6 betätigt werden. Dabei kann es zweckmäßig sein, den Flansch 13 axial verstellbar am Rohr 3 zu befestigen, so daß eine Voreinstellung der maximalen Auslenkung der Lamellen 14 bei jeder Lamellenanordnung möglich ist. Die Hüllfläche, die die Lamellenanordnungen gemeinsam bestimmen und die vom Folienhals der Schlauchfolie verkörpert wird, kann im Betriebszustand damit zylindrisch oder konisch mit Erweiterung bzw. Verengung nach oben eingestellt werden.In the threaded bushing 8 driver pins 9 are used, which are in longitudinal slots 10 are guided in the tube 3 and frictionally with the sliding ring 11 in Connected. In ring 11 and in ring 12, whose axial position is through the tube 3 connected flange 13 is determined, the slats 14 are made of thin spring steel clamped, wherein the clamping surfaces of the rings 11 and 12 are slightly conical are, so that the slats 14 in the initial position, d. H. at the maximum distance between the rings 11 and 12, are already slightly curved outwards (Fig. 1, left side). The threaded rod 6 is passed through the blow head 2 and can be outside of the blow head 2 (in here not shown) are operated, z. B. by a hand crank. at long film shark of the tubular film 15 can have several arrangements according to FIG Tube 3 are arranged and operated together with the threaded rod 6. It may be useful to attach the flange 13 axially adjustable on the tube 3, so that a presetting of the maximum deflection of the slats 14 for each slat arrangement is possible. The envelope surface, which determine the lamellar arrangements together and which is embodied by the film neck of the tubular film, can in the operating state with it cylindrical or conical with widening or narrowing upwards.

- Leerseite -- blank page -

Claims (6)

Innenstabilisator für Kunststoffschlauchfolien I. Patentansprüche 1. Innenstabilisator für Kunststoffschlauchfolien, der einem mit einer Schneckenstrangpresse verbundenen Blaskopf mit Ringspaltdüse nachgeschaltet ist und der eine koaxial zur Ringspaltdüse sich erstreckende Fläche in Form eines Zylinders oder schlanken Konus bestimmt, an der die extrudierte Schlauchfolie entlanggeführt wird und die durch einzelne, während des Extrudiervorganges mit einer von außen betätigbaren Verstellvorrichtung bewegbare Elemente einer eine zylindrische oder konische Hüllfläche bestimmenden Anordnung gebildet wird, nach Patent(anmeldung P) 33 31 945, dadurch g e k e n n z e i c h n et , daß die bewegbaren Elemente als mit ihrer Längserstreckung axial ausgerichtete, einen gedachten, koaxialen Rotationskörper als Tangentenflächen berührende Lamellen (14) aus einem elastischen Material ausgebildet sind, deren Enden relativ zueinander in Richtung der Blaskopfachse (16) verschiebbar sind. Internal stabilizer for tubular plastic films I. Claims 1. Internal stabilizer for tubular plastic films, one with a screw extruder connected blow head with annular gap nozzle is connected downstream and the one coaxially to Annular gap nozzle extending surface in the form of a cylinder or slim cone determined along which the extruded tubular film is guided and through individual, during the extrusion process with an adjustment device that can be operated from the outside movable elements of a cylindrical or conical envelope surface determining Arrangement is formed according to patent (registration P) 33 31 945, thereby g e k e n n z e i c h n et that the movable elements as with their longitudinal extension axial aligned, an imaginary, coaxial body of revolution as tangent surfaces touching Lamellae (14) are formed from an elastic material, the ends of which are relative are mutually displaceable in the direction of the blow head axis (16). 2. Innenstabilisator nach Anspruch 1, dadurch g e k e n n -z ei c h n e t , daß die Enden der Lamellen (14) in einen oberen Ring (11) und einen unteren Ring (12) eingespannt sind, wobei der untere Ring (12) bezüglich der Blaskopfachse (16) feststehend und der obere Ring (11) mit Hilfe einer außerhalb des Blaskopfes (2) betätigbaren Verstelleinrichtung in Achsrichtung verschiebbar angeordnet ist. 2. Internal stabilizer according to claim 1, characterized in that g e k e n n -z ei c h n e t that the ends of the slats (14) in an upper ring (11) and a lower Ring (12) are clamped, the lower ring (12) with respect to the blow head axis (16) fixed and the upper ring (11) with the help of an outside of the blow head (2) actuatable adjusting device is arranged displaceably in the axial direction. 3. Innenstabilisator nach Anspruch 2, dadurch g e k e n n -z e i c h n e t , daß als Verstelleinrichtung eine innerhalb eines fest mit dem Blaskopf (2) verbundenen koaxialen Rohres (3) drehbar gelagerte Gewindestange (6) mit axial geführter und kraftschlüssig mit dem oberen Ring (11) verbundener Gewindebuchse (8) dient.3. Internal stabilizer according to claim 2, characterized in that g e k e n n -z e i c h n e t that as an adjusting device one within a fixed with the blow head (2) connected coaxial tube (3) rotatably mounted threaded rod (6) with axially guided and non-positively connected to the upper ring (11) threaded bushing (8) is used. 4. Innenstabilisator nach einem der Ansprüche 1 bis 3, dadurch g e k e n n z e i c h n e t , daß mehrere gleichartig ausgebildete und gemeinsam von der Verstelleinrichtung betätigbare, axial aufeinanderfolgende Lamellenanordnungen vorgesehen sind.4. Internal stabilizer according to one of claims 1 to 3, characterized g e k e n n n z e i c h n e t that several identically trained and jointly by the adjusting device actuatable, axially successive lamella arrangements are provided. 5. Innenstabilisator nach Anspruch 4, dadurch g e k e n n -z e i c h n e t , daß der untere Ring (12) jeder Lamellenanordnung axial verstellbar ausgebildet ist.5. Internal stabilizer according to claim 4, characterized in that g e k e n n -z e i c h n e t that the lower ring (12) of each lamella arrangement is designed to be axially adjustable is. 6. Innenstabilisator nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Flächen der Lamellen (14), an denen die extrudierte Schlauchfolie (15) entlanggeführt wird, mit einer das Anhaften der Schlauchfolie verhindernden Beschichtung versehen sind.6. Internal stabilizer according to one of claims 1 to 5, characterized in that that the surfaces of the lamellae (14) along which the extruded tubular film (15) is guided is provided with a coating preventing the tubular film from sticking are.
DE19833335718 1983-10-01 1983-10-01 Internal stabiliser for plastics tubular films Ceased DE3335718A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19833335718 DE3335718A1 (en) 1983-10-01 1983-10-01 Internal stabiliser for plastics tubular films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833335718 DE3335718A1 (en) 1983-10-01 1983-10-01 Internal stabiliser for plastics tubular films

Publications (1)

Publication Number Publication Date
DE3335718A1 true DE3335718A1 (en) 1985-05-02

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DE19833335718 Ceased DE3335718A1 (en) 1983-10-01 1983-10-01 Internal stabiliser for plastics tubular films

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585985A1 (en) * 1985-08-10 1987-02-13 Super Bag Co Ltd METHOD AND DEVICE FOR EXTRUSION OF FILM BY BLOWING COMPRISING A BUBBLE STABILIZER
DE3815415A1 (en) * 1988-05-06 1989-11-16 Kiefel Gmbh Paul HIGH-PERFORMANCE COOLING METHOD AND DEVICE FOR THE PRODUCTION OF BI-ORIENTED FILMS FROM HIGH AND MEDIUM MOLAR THERMOPLASTICS
WO2005005129A1 (en) * 2003-07-01 2005-01-20 Equistar Chemicals, Lp Process for extrusion and blowing of polyethylene films
DE102005006474A1 (en) * 2005-02-12 2006-08-17 Kiefel Extrusion Gmbh Blown tubular plastic production involves extruded tubular film passing expandable bellows which is internally cooled and held at pressure above atmospheric

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3074108A (en) * 1960-04-25 1963-01-22 Phillips Petroleum Co Apparatus for biaxially orienting thermoplastic film
DE1778959B1 (en) * 1967-06-26 1971-10-14 Shell Int Research DEVICE FOR COOLING A TUBE FILM MADE FROM THERMOPLASTIC PLASTIC, PRODUCED BY EXTRUSION
DE1629431B2 (en) * 1965-06-15 1971-11-18 General Engineering Co. (Radcliffe) Ltd., Radcliffe, Manchester, Lancashire (Grossbritannien) METHOD AND DEVICE FOR MANUFACTURING TUBULAR FILM RAILS FROM THERMOPLASTIC PLASTICS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3074108A (en) * 1960-04-25 1963-01-22 Phillips Petroleum Co Apparatus for biaxially orienting thermoplastic film
DE1629431B2 (en) * 1965-06-15 1971-11-18 General Engineering Co. (Radcliffe) Ltd., Radcliffe, Manchester, Lancashire (Grossbritannien) METHOD AND DEVICE FOR MANUFACTURING TUBULAR FILM RAILS FROM THERMOPLASTIC PLASTICS
DE1778959B1 (en) * 1967-06-26 1971-10-14 Shell Int Research DEVICE FOR COOLING A TUBE FILM MADE FROM THERMOPLASTIC PLASTIC, PRODUCED BY EXTRUSION

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585985A1 (en) * 1985-08-10 1987-02-13 Super Bag Co Ltd METHOD AND DEVICE FOR EXTRUSION OF FILM BY BLOWING COMPRISING A BUBBLE STABILIZER
DE3626834A1 (en) * 1985-08-10 1987-03-05 Super Bag Co FILM BLOW EXTRUSION METHOD AND DEVICE
DE3815415A1 (en) * 1988-05-06 1989-11-16 Kiefel Gmbh Paul HIGH-PERFORMANCE COOLING METHOD AND DEVICE FOR THE PRODUCTION OF BI-ORIENTED FILMS FROM HIGH AND MEDIUM MOLAR THERMOPLASTICS
WO2005005129A1 (en) * 2003-07-01 2005-01-20 Equistar Chemicals, Lp Process for extrusion and blowing of polyethylene films
US6903162B2 (en) 2003-07-01 2005-06-07 Equistar Chemicals, Lp Preparation of polyethylene films
DE102005006474A1 (en) * 2005-02-12 2006-08-17 Kiefel Extrusion Gmbh Blown tubular plastic production involves extruded tubular film passing expandable bellows which is internally cooled and held at pressure above atmospheric

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