DE10217502B4 - Device for regulating the internal pressure of a blown film tube - Google Patents

Device for regulating the internal pressure of a blown film tube Download PDF

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Publication number
DE10217502B4
DE10217502B4 DE10217502A DE10217502A DE10217502B4 DE 10217502 B4 DE10217502 B4 DE 10217502B4 DE 10217502 A DE10217502 A DE 10217502A DE 10217502 A DE10217502 A DE 10217502A DE 10217502 B4 DE10217502 B4 DE 10217502B4
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Prior art keywords
differential pressure
blown film
film tube
behind
controller
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Expired - Fee Related
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DE10217502A
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German (de)
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DE10217502A1 (en
Inventor
Dieter Baschant
Roberto Wolff
Heinz Gatzmanda
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M & R Mes und Regelungstechnik
M+r Mess- und Regelungstechnik -An-Institut An Der Fh Anhalt GmbH
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M & R Mes und Regelungstechnik
M+r Mess- und Regelungstechnik -An-Institut An Der Fh Anhalt GmbH
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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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92923—Calibration, after-treatment or cooling zone
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92942—Moulded article
    • 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
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Vorrichtung zur Regelung des Innendrucks eines Blasfolienschlauches (1), dadurch gekennzeichnet,
– dass eingangsseitig ein Differenzdruckwandler (3) angeordnet ist, der den Differenzdruck zwischen Umgebung und Schlauchinnerem misst,
– dass hinter dem Differenzdruckwandler (3) ein Regler (4) mit I-Anteil zur Konstanthaltung des Differenzdruckes angeordnet ist,
– dass hinter dem Regler (4) eine proportional wirkende Stelleinrichtung (5) angeordnet ist, die über Leitungen (9, 12) mit dem Inneren des Blasfolienschlauches (1) verbunden ist,
– und dass hinter der Stelleinrichtung (5) in der Zuluftleitung (9) zum Blaskopf (2) ein elastischer Gasspeicher (6) angeordnet ist.Device for regulating the internal pressure of a blown film tube (1), characterized
- That on the input side a differential pressure transducer (3) is arranged, which measures the differential pressure between the environment and the hose interior,
- That behind the differential pressure transducer (3) a controller (4) is arranged with I-component for keeping constant the differential pressure,
- That behind the controller (4) a proportionally acting adjusting device (5) is arranged, which is connected via lines (9, 12) to the interior of the blown film tube (1),
- And that behind the adjusting device (5) in the air supply line (9) to the blow head (2), an elastic gas reservoir (6) is arranged.

Figure 00000001
Figure 00000001

Description

Die Erfindung betrifft eine Vorrichtung zur Regelung des Innendrucks eines Blasfolienschlauches.The The invention relates to a device for regulating the internal pressure a blown film tube.

Derartige Vorrichtungen werden bei Herstellung von Folienschläuchen angewandt, wobei die Aufgabenstellung der Erzeugung eines konstanten Innendruckes nicht auf Folienschläuche aus thermoplastischen Kunststoffen beschränkt ist, sondern bei der Herstellung jeglicher Blasfolien relevant ist, so zum Beispiel auch bei der Herstellung von nahtlosen Folienschläuchen auf Cellulosebasis.such Devices are used in the manufacture of film hoses, the task being the generation of a constant internal pressure not on foil tubes is limited to thermoplastic materials, but in the production any blown film is relevant, so for example in the case of Production of seamless film tubes based on cellulose.

Bei der Herstellung von Folienschläuchen muss die Prozessführung gewährleisten, dass ein Folienschlauch mit konstantem Kaliber und konstanter Dicke beziehungsweise Struktur hergestellt wird. Verfahren und Vorrichtungen zur Herstellung von Blasfolien entsprechend diesem Ziel sind seit langem bekannt und werden in einer Vielzahl von Patentveröffentlichungen beschrieben ( DE 26 58 518 C2 , DE 40 01 287 A1 , DE 42 18 994 C1 , DE 100 35 798 A1 , DE 198 21 856 A1 , EP 0 583 619 B1 , EP 0 771 640 B1 , US 40 69 292 ), wobei das Einblasen des Gases in einen durch Extrusion erzeugten plastischen Schlauch und die Erzeugung eines konstanten Innendrucks als dem Stand der Technik entsprechend dargestellt werden.In the production of film hoses, the process management must ensure that a film tube of constant caliber and constant thickness or structure is produced. Methods and apparatus for producing blown films in accordance with this aim have been known for a long time and are described in a large number of patent publications (US Pat. DE 26 58 518 C2 . DE 40 01 287 A1 . DE 42 18 994 C1 . DE 100 35 798 A1 . DE 198 21 856 A1 . EP 0 583 619 B1 . EP 0 771 640 B1 . US 40 69 292 ), wherein the injection of the gas into an extrusion-produced plastic tube and the generation of a constant internal pressure are represented as corresponding to the prior art.

In der US 40 69 292 wird zusätzlich zum Einblasen von Gas in den Schlauch ein Abblasventil beschrieben, dass bei Überschreiten eines einstellbaren Druckmaximums im Schlauch öffnet und einen schnellen Druckabbau gewährleistet.In the US 40 69 292 In addition to the injection of gas into the hose, a blow-off valve is described which opens when an adjustable pressure maximum in the hose is exceeded and ensures a rapid pressure reduction.

Demgegenüber werden spezielle Formgebungsverfahren beschrieben, beispielsweise die Wirkung und Steuerung von Außenluftblasringen, äußeren Kühlluftschleiern und -strömungen in der DE 26 58 518 C2 , der DE 40 01 287 A1 , der DE 42 18 994 C1 , der DE 198 21 856 A1 und der EP 0 583 619 B1 , das Verdrillen der Folienblase in der DE 36 10 488 A1 , die Prozessparameter der Extrusion in der EP 0 771 640 B1 oder die Technologie des Verspinnens eines Celluloseschlauches in einem Spinnbad in der DE 100 35 798 A1 .In contrast, special shaping methods are described, for example, the effect and control of Außenluftblasringen, outer Kühlluftschleiern and currents in the DE 26 58 518 C2 , of the DE 40 01 287 A1 , of the DE 42 18 994 C1 , of the DE 198 21 856 A1 and the EP 0 583 619 B1 , the twisting of the film bubble in the DE 36 10 488 A1 , the process parameters of extrusion in the EP 0 771 640 B1 or the technology of spinning a cellulosic tube in a spinning bath in the DE 100 35 798 A1 ,

Es hat sich jedoch gezeigt, dass unter anderem bei mehrschichtigen Lebensmittelfolien sehr große Probleme mit Kaliberschwankungen (Eierketten) auftreten. Als eine Hauptursache hierfür werden Druckschwankungen im Innern des Blasfolienschlauches (1) angesehen. Unter diesem Gesichtspunkt ist eine hohe Konstanz des Differenzdruckes zwischen Schlauchinnerem und Umgebungsdruck gefordert. Diese Regelung muss dementsprechend schnell und möglichst schwingungsfrei arbeiten, wobei häufig Differenzdrücke von wenigen Millibar konstant zu halten sind.However, it has been shown that among other things in multilayer food films very large problems with caliber fluctuations (egg chains) occur. As a main cause of this pressure fluctuations in the interior of the blown film tube ( 1 ). From this point of view, a high constancy of the differential pressure between the hose interior and ambient pressure is required. Accordingly, this regulation must work quickly and as free of vibration as possible, whereby differential pressures of a few millibars are frequently to be kept constant.

Die Regelung dieses Druckes ist unter anderem deshalb problematisch, weil eine auftretende Kaliberschwankung beim Eintritt des Schlauches in die Flachlegeeinrichtung (14) eine Druckinstabilität innerhalb des Schlauches (1) hervorruft, die in der elastischen Zone direkt unterhalb des Blaskopfes (2) potentiell eine neue Kaliberschwankung erzeugt. Ein weiteres Problem besteht darin, dass auf Grund der im allgemeinen hohen Temperaturen am Blaskopf, das Stellglied in einem gewissen Abstand vom Blaskopf installiert wird, was aus regelungstechnischer Sicht Totzeiten hervorruft. Diese Totzeiten erreichen dieselbe Größenordnung wie die Summenzeitkonstante der Druckregelstrecke, woraus eine schlechte Regelbarkeit und damit potentielle Regelschwingungen und Kaliberschwankungen resultieren.The regulation of this pressure is problematic, inter alia, because an occurring caliber fluctuation at the entrance of the tube in the flattening device ( 14 ) a pressure instability within the tube ( 1 ) in the elastic zone directly below the Blaskopfes ( 2 ) potentially creates a new caliber variation. Another problem is that due to the generally high temperatures at the die, the actuator is installed at a certain distance from the die, which causes dead times from a control engineering point of view. These dead times reach the same order of magnitude as the summation time constant of the pressure control path, resulting in poor controllability and thus potential control oscillations and caliber fluctuations.

Dementsprechend besteht die Aufgabe der Erfindung darin, eine schnelle und möglichst schwingungsfrei arbeitende Vorrichtung zur Regelung des Schlauchinnendrucks eines Blasfolienschlauches anzugeben, die einstellbare Differenzdrücke von wenigen Millibar über Umgebung konstant hält, wodurch ein Folienschlauch mit konstantem und fein einstellbarem Kaliber hergestellt werden kann.Accordingly The object of the invention is a fast and possible vibration-free device for controlling the hose internal pressure a blown film hose, the adjustable differential pressures of a few millibars above Environment keeps constant, whereby a film tube with constant and finely adjustable Caliber can be made.

Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung zur Regelung des Innendrucks eines Blasfolienschlauches (1) gelöst, dadurch gekennzeichnet,

  • – dass eingangsseitig ein Differenzdruckwandler (3) angeordnet ist, der den Differenzdruck zwischen Umgebung und Schlauchinnerem misst,
  • – dass hinter dem Differenzdruckwandler (3) ein Regler (4) mit I-Anteil zur Konstanthaltung des Differenzdruckes angeordnet ist,
  • – dass hinter dem Regler eine proportional wirkende Stelleinrichtung (5) angeordnet ist, die über Leitungen (9, 12) mit dem Inneren des Blasfolienschlauches (1) verbunden ist,
  • – und dass hinter der Stelleinrichtung (5) in der Zuluftleitung (9) zum Blaskopf (2) ein elastischer Gasspeicher (6) angeordnet ist.
This object is achieved by a device for controlling the internal pressure of a blown film tube ( 1 ), characterized
  • - that on the input side a differential pressure transducer ( 3 ), which measures the differential pressure between the environment and the interior of the tube,
  • - that behind the differential pressure transducer ( 3 ) a controller ( 4 ) is arranged with I-component for keeping constant the differential pressure,
  • - that behind the regulator a proportionally acting adjusting device ( 5 ) is arranged, which via lines ( 9 . 12 ) with the interior of the blown film tube ( 1 ) connected is,
  • - and that behind the control device ( 5 ) in the supply air line ( 9 ) to the blow head ( 2 ) an elastic gas storage ( 6 ) is arranged.

Nachfolgend wird eine Ausführungsform der Erfindung unter Bezugnahme auf die 1 beschrieben.Hereinafter, an embodiment of the invention with reference to the 1 described.

Der Regler (4) kann vorzugsweise ein PI- oder ein PID-Regler sein, der des weiteren über Möglichkeiten zur Sollwertverstellung verfügt, mittels denen der Differenzdruck zwischen Umgebung und Schlauchinnerem und damit das zu produzierende Kaliber des Blasfolienschlauches (1) fein eingestellt werden kann.The regulator ( 4 ) may preferably be a PI or a PID controller, which also has options for setpoint adjustment, by means of which the differential pressure between environment and Inside of the hose and thus the caliber of the blown film tube to be produced ( 1 ) can be fine tuned.

Die proportional wirkende Stelleinrichtung (5) besteht in einer bevorzugten Ausführungsform aus einer Leistungselektronik und einer Gaspumpe, welche über ein Filterelement (7) Umgebungsluft ansaugt.The proportionally acting adjusting device ( 5 ) consists in a preferred embodiment of a power electronics and a gas pump, which via a filter element ( 7 ) Draws in ambient air.

Der hinter der Stelleinrichtung (5) und vor dem Blaskopf (2) angeordnete elastische Gasspeicher (6) ist vorzugsweise eine Kautschukblase, die über ein T-Stück in die Zuluftleitung zum Blaskopf geschaltet wird.The behind the adjusting device ( 5 ) and in front of the blow head ( 2 ) arranged elastic gas storage ( 6 ) is preferably a rubber bubble, which is connected via a tee in the air supply line to Blaskopf.

Die Verbindung zwischen Druckregelvorrichtung und Blaskopf besteht aus drei Leitungen, der Druckmessleitung (8), der Zuluftleitung (9) und der Abluftleitung (10), die vorzugsweise über drei Belüftungsrohre (11, 12, 13) mit dem Inneren des Folienschlauches in Verbindung stehen.The connection between pressure control device and blow head consists of three lines, the pressure measuring line ( 8th ), the supply air line ( 9 ) and the exhaust duct ( 10 ), preferably via three ventilation pipes ( 11 . 12 . 13 ) communicate with the interior of the film tube.

Mit diesem Aufbau wird das Zeitverhalten der Druckregelstrecke beeinflusst und es gelingt, das Regelverhalten der Druckregelung wesentlich zu verbessern und eine hohe Konstanz des Kalibers zu gewährleisten.With This structure influences the timing of the pressure control system and it succeeds, the control behavior of the pressure control significantly to improve and to ensure a high consistency of the caliber.

Claims (8)

Vorrichtung zur Regelung des Innendrucks eines Blasfolienschlauches (1), dadurch gekennzeichnet, – dass eingangsseitig ein Differenzdruckwandler (3) angeordnet ist, der den Differenzdruck zwischen Umgebung und Schlauchinnerem misst, – dass hinter dem Differenzdruckwandler (3) ein Regler (4) mit I-Anteil zur Konstanthaltung des Differenzdruckes angeordnet ist, – dass hinter dem Regler (4) eine proportional wirkende Stelleinrichtung (5) angeordnet ist, die über Leitungen (9, 12) mit dem Inneren des Blasfolienschlauches (1) verbunden ist, – und dass hinter der Stelleinrichtung (5) in der Zuluftleitung (9) zum Blaskopf (2) ein elastischer Gasspeicher (6) angeordnet ist.Device for regulating the internal pressure of a blown film tube ( 1 ), characterized in that - on the input side, a differential pressure transducer ( 3 ), which measures the differential pressure between the environment and the interior of the tube, that behind the differential pressure transducer ( 3 ) a controller ( 4 ) is arranged with I-component for keeping constant the differential pressure, - that behind the controller ( 4 ) a proportionally acting adjusting device ( 5 ) is arranged, which via lines ( 9 . 12 ) with the interior of the blown film tube ( 1 ), and that behind the control device ( 5 ) in the supply air line ( 9 ) to the blow head ( 2 ) an elastic gas storage ( 6 ) is arranged. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Regler (4) mit I-Anteil ein PI-Regler ist.Device according to claim 1, characterized in that the regulator ( 4 ) with I component is a PI controller. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Regler (4) mit I-Anteil ein PID-Regler ist.Device according to claim 1, characterized in that the regulator ( 4 ) with I component is a PID controller. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die proportional wirkende Stelleinrichtung (5) mit P-Verhalten eine Gaspumpe mit Leistungselektronik ist.Apparatus according to claim 1, characterized in that the proportionally acting adjusting device ( 5 ) with P-behavior is a gas pump with power electronics. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Gaspumpe an der Saugseite mit der Umgebungsluft verbunden ist.Device according to claim 4, characterized in that that the gas pump on the suction side connected to the ambient air is. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die proportional wirkende Stelleinrichtung (5) mit P-Verhalten ein Regelventil mit Leistungselektronik ist.Apparatus according to claim 1, characterized in that the proportionally acting adjusting device ( 5 ) with P-behavior is a control valve with power electronics. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der elastische Gasspeicher (6) eine Kautschukblase ist.Device according to claim 1, characterized in that the elastic gas reservoir ( 6 ) is a rubber bubble. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Regler (4) mit I-Anteil Mittel zur Sollwerteinstellung besitzt und dass damit das zu produzierende Kaliber des Blasfolienschlauches (1) fein eingestellt werden kann.Device according to claim 1, characterized in that the regulator ( 4 ) with I-portion has means for setpoint adjustment and that thus the caliber of the blown film tube to be produced ( 1 ) can be fine tuned.
DE10217502A 2002-04-19 2002-04-19 Device for regulating the internal pressure of a blown film tube Expired - Fee Related DE10217502B4 (en)

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DE10217502B4 true DE10217502B4 (en) 2005-12-01

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CN116872482A (en) * 2023-08-01 2023-10-13 瑞安市松盛机械有限公司 Three-layer co-extrusion film blowing machine capable of removing dust and static electricity

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069292A (en) * 1974-08-28 1978-01-17 Mobil Oil Corporation Pressure control in tubular thermoplastic extrusion
DE2658518C2 (en) * 1976-12-23 1983-04-28 Reifenhäuser KG, 5210 Troisdorf Plant for the production of blown films made of thermoplastic material
DE3610488A1 (en) * 1985-04-03 1986-10-16 Tomy Machinery Mfg. Co., Ltd., Tokio/Tokyo Process and device for producing blown films
DE4001287A1 (en) * 1990-01-18 1991-07-25 Stefan Konermann Local correction of blown film thickness using variable air flow
DE4218994C1 (en) * 1992-06-10 1993-12-09 Reifenhaeuser Masch Method of evening out thickness tolerances in blown film tubing - by mounting regulating devices on circular support divided into many identical segments and turning the support through half one segment length
EP0583619B1 (en) * 1992-07-15 1999-04-28 Showa Denko Kabushiki Kaisha Method and apparatus for molding inflation film
DE19821856A1 (en) * 1998-05-15 1999-11-25 Lean Tec Entwicklungs Gmbh Process for producing blown films and device for carrying out the process
EP0771640B1 (en) * 1995-11-01 2001-06-13 Mitsui Chemicals, Inc. Method of producing inflation film, apparatus therefor and molded articles thereof
DE10035798A1 (en) * 2000-07-22 2002-01-31 Kalle Nalo Gmbh & Co Kg Method and device for producing a seamless film tube and seamless film tube

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069292A (en) * 1974-08-28 1978-01-17 Mobil Oil Corporation Pressure control in tubular thermoplastic extrusion
DE2658518C2 (en) * 1976-12-23 1983-04-28 Reifenhäuser KG, 5210 Troisdorf Plant for the production of blown films made of thermoplastic material
DE3610488A1 (en) * 1985-04-03 1986-10-16 Tomy Machinery Mfg. Co., Ltd., Tokio/Tokyo Process and device for producing blown films
DE4001287A1 (en) * 1990-01-18 1991-07-25 Stefan Konermann Local correction of blown film thickness using variable air flow
DE4218994C1 (en) * 1992-06-10 1993-12-09 Reifenhaeuser Masch Method of evening out thickness tolerances in blown film tubing - by mounting regulating devices on circular support divided into many identical segments and turning the support through half one segment length
EP0583619B1 (en) * 1992-07-15 1999-04-28 Showa Denko Kabushiki Kaisha Method and apparatus for molding inflation film
EP0771640B1 (en) * 1995-11-01 2001-06-13 Mitsui Chemicals, Inc. Method of producing inflation film, apparatus therefor and molded articles thereof
DE19821856A1 (en) * 1998-05-15 1999-11-25 Lean Tec Entwicklungs Gmbh Process for producing blown films and device for carrying out the process
DE10035798A1 (en) * 2000-07-22 2002-01-31 Kalle Nalo Gmbh & Co Kg Method and device for producing a seamless film tube and seamless film tube

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