DE4236443A1 - Temp. regulation of foil blowing head - for plastic bag foil mfr. using circuits for common and individual regulation of integrated heating cartridges - Google Patents

Temp. regulation of foil blowing head - for plastic bag foil mfr. using circuits for common and individual regulation of integrated heating cartridges

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Publication number
DE4236443A1
DE4236443A1 DE4236443A DE4236443A DE4236443A1 DE 4236443 A1 DE4236443 A1 DE 4236443A1 DE 4236443 A DE4236443 A DE 4236443A DE 4236443 A DE4236443 A DE 4236443A DE 4236443 A1 DE4236443 A1 DE 4236443A1
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Germany
Prior art keywords
heating
temperature
film
heating cartridges
head
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE4236443A
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German (de)
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DE4236443B4 (en
Inventor
Werner Dr Feistkorn
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.)
Windmoeller and Hoelscher KG
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Windmoeller and Hoelscher KG
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Priority to DE4236443A priority Critical patent/DE4236443B4/en
Publication of DE4236443A1 publication Critical patent/DE4236443A1/en
Application granted granted Critical
Publication of DE4236443B4 publication Critical patent/DE4236443B4/en
Anticipated expiration legal-status Critical
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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1927Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1932Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
    • G05D23/1934Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces each space being provided with one sensor acting on one or more control means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/09Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/78Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/78Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/865Heating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/78Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/87Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/20Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92609Dimensions
    • B29C2948/92647Thickness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92704Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92857Extrusion unit
    • B29C2948/92904Die; Nozzle zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92923Calibration, after-treatment or cooling zone

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Remote Sensing (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Temp. regulation of a foil blowing head for plastic bag foil mfr., in which the head has integrated peripheral heating cartridges, involves (a) heating the cartridges (18) via a first regulating circuit such that their mean output heat flux heats the head to a target temp.; and (b) additionally heating or cooling the individual cartridges via a second regulating circuit such that the heat flux can be increased or decreased at single locations in the head (12) to equalise thick or thin regions of the plastic bag foil (16). ADVANTAGE - The temp. regulation is simple and avoids the need for separate external heating.

Description

Die Erfindung betrifft Verfahren zur Temperaturregelung eines Folienblaskopfes zur Herstellung von Kunststoff-Schlauchfolien.The invention relates to a method for temperature control Foil blowing head for the production of plastic tubular films.

Folienblasköpfe zur Herstellung von Schlauchfolien aus thermo­ plastischen Kunststoffen bestehen in der Regel aus einem Innen­ ring oder aus einem inneren Kern und einem Außenring, zwischen denen ein ringförmiger Düsenspalt gebildet ist.Foil blowing heads for the production of tubular foils from thermo Plastic plastics usually consist of an interior ring or an inner core and an outer ring, between which an annular nozzle gap is formed.

Derartige Kunststoffblasfolienköpfe sind beispielsweise aus der DE-AS 21 40 194 sowie der DE-PS 29 47 293 und der DE-PS 29 50 003 bekannt.Such plastic blown film heads are for example from the DE-AS 21 40 194 and DE-PS 29 47 293 and DE-PS 29 50 003 known.

Um im Blasverfahren hergestellte Schlauchfolien mit über den Um­ fang gleicher Foliendicke herzustellen, ist es erforderlich, die Massetemperatur der Kunststoffschmelze in dem ringförmigen Düsen­ spalt der Extrusionsdüse einstellen zu können, um durch entspre­ chende Änderung der Viskosität den Fluß der austretenden Kunst­ stoffschmelze beeinflussen zu können.To blow-molded tubular films with over the Um start producing the same film thickness, it is necessary to Melt temperature of the plastic melt in the annular nozzle to be able to adjust the gap of the extrusion nozzle to correspond with appropriate change in viscosity the flow of emerging art to be able to influence melt.

Die bekannten Folienblasköpfe weisen einerseits eine Außenbehei­ zung zum Aufheizen des Folienblaskopfes auf die Arbeitstempera­ tur von beispielsweise ca. 250°C auf. Zusätzlich sind innerhalb des Folienblaskopfes Temperiersegmente oder Temperiersektoren mit Kanälen oder Bohrungen versehen, durch die beispielsweise ein kühlendes oder erwärmendes Medium geleitet werden kann, um durch entsprechende Erhöhung oder Erniedrigung der Temperatur des jeweiligen Temperiersektors das Temperaturprofils über den Umfang des Folienblaskopfes und damit über den Umfang der Ring­ düse in der gewünschten Weise ändern zu können. Bei den bekann­ ten Ringdüsen besteht das kühlende oder erwärmende Medium aus Luft, Öl oder anderen flüssigen oder gasförmigen Stoffen, die den Temperiersektoren Wärme zuführen oder Wärme von diesen abfüh­ ren können. Alternativ dazu ist es aber auch schon bekannt, im Innen- und/oder Außenring auf den Umfang verteilt in entsprechen­ den Bohrungen oder Aussparungen elektrische Heizpatronen einzu­ setzen.The known film blowing heads have an external heater on the one hand  for heating the film die head to the working temperature of about 250 ° C, for example. Additionally are inside of the film die head temperature control segments or temperature control sectors provided with channels or holes through which, for example a cooling or heating medium can be directed to by increasing or decreasing the temperature accordingly the temperature profile of the respective temperature sector The circumference of the film die head and thus the circumference of the ring to be able to change the nozzle in the desired manner. With the known The cooling or heating medium consists of the ring nozzles Air, oil or other liquid or gaseous substances that supply heat to or remove heat from the temperature control sectors can. Alternatively, it is already known in the Inner and / or outer ring distributed over the circumference in accordance to insert electric heating cartridges into the holes or recesses put.

Bei dieser vorbekannten Beheizung von Folienblasköpfen kommt es zu Wechselwirkungen zwischen dem Heizungsregelkreis für die Außenbeheizung und dem sogenannten Profilregelkreis für die auf Umfang angeordneten Heizpatronen. Die separate Dickenregelung der Heizpatronen kann dazu führen, daß von den Düsentemperatur­ sollwerten abweichende Werte auftreten.It happens with this previously known heating of film blowing heads interactions between the heating control loop for the External heating and the so-called profile control loop for the Circumferentially arranged heating cartridges. The separate thickness control The cartridge heater can cause the nozzle temperature deviating values occur.

Aufgabe der vorliegenden Erfindung ist es, diese Wechselwirkun­ gen zu vermeiden und ein vereinfachtes Temperaturregelverfahren für einen Folienblaskopf an die Hand zu geben.The object of the present invention is to achieve this interaction to avoid and a simplified temperature control process for a film blowing head.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß in einem Folienblaskopf, in welchem nur auf Umfang verteilte Heizpatronen integriert sind und in welchem auf die separate Außenbeheizung verzichtet wird, folgende Schritte durchgeführt werden:According to the invention this object is achieved in that in one Foil blowing head, in which heating cartridges are only distributed over the circumference are integrated and in which on the separate external heating the following steps are carried out:

  • a) Aufheizen der Heizpatronen über einen ersten Regelkreis derart, daß der mittlere von innen abgegebene Wärme­ strom den Folienblaskopf auf eine Solltemperatur auf­ heizt unda) Heating the heating cartridges via a first control loop such that the average heat given off from the inside flow up the film die head to a target temperature heats and
  • b) zusätzliches individuelles Aufheizen bzw. Abkühlen der einzelnen Heizpatronen über einen zweiten Regelkreis derart, daß an singulären Stellen des Folienblaskopfs der Wärmestrom erhöht bzw. erniedrigt werden kann, um Dick- bzw. Dünnstellen der Kunststoffolien auszuglei­ chen.b) additional individual heating or cooling of the individual heating cartridges via a second control loop such that at singular locations on the film die the heat flow can be increased or decreased in order to To compensate for thick or thin spots on the plastic films chen.

Der entscheidende Vorteil dieses Verfahrens liegt darin, daß kei­ ne zusätzliche Energie für die Profilregelung eingespeist werden muß, da die ohnehin benötigte Heizleistung zur Düsentemperaturre­ gelung derart verteilt wird, daß das Dickenprofil vergleichmä­ ßigt wird.The key advantage of this process is that it does not ne additional energy for the profile control can be fed must, since the heating power required anyway to the nozzle temperature gelung is distributed such that the thickness profile is even is needed.

Die Abgabe des Wärmestroms, der von den einzelnen Heizpatronen abgegeben wird, kann über deren Einschaltdauer eingestellt wer­ den. Alternativ dazu könnte der Wärmestrom auch durch Drosselung der Stromzufuhr an die Heizpatronen geregelt werden.The delivery of heat flow from the individual heating cartridges is delivered, who can be set via their duty cycle the. Alternatively, the heat flow could be throttled the power supply to the heating cartridges can be regulated.

Die Solltemperatur des Folienblaskopfes kann über mehrere Tempe­ raturfühler am Umfang der im Folienblaskopf integrierten Ringdü­ se verteilt aufgenommen werden. Mit drei Temperaturfühlern, die auf Umfang verteilt sind, können gute Regelergebnisse erzielt werden.The target temperature of the film die head can be over several temp temperature sensor on the circumference of the ring nozzle integrated in the film blowing head se distributed. With three temperature sensors that distributed over the scope, good control results can be achieved become.

Der zweite Regelkreis, d. h. der sogenannte Profilregelkreis, kann die Heizpatronen entsprechend dem aktuellen Dickenprofil der extrudierten Kunststoff-Schlauchfolie ansteuern. The second control loop, i. H. the so-called profile control loop, can the cartridge heater according to the current thickness profile control the extruded plastic tubular film.  

Beim Aufheizen des Folienblaskopfes können alle Heizpatronen ent­ sprechend ihrer maximalen Heizleistung den maximalen Wärmestrom abgeben und nach Erreichen der Solltemperatur können die Heizpa­ tronen während definierter Einschaltzeitintervalle zur Abgabe des gewünschten Wärmestroms angeschaltet werden.When heating the film die head, all heating cartridges can be removed speaking of their maximum heating power the maximum heat flow and after reaching the target temperature, the heating pa dispensing during defined switch-on time intervals of the desired heat flow can be switched on.

Weitere Einzelheiten und Vorteile ergeben sich aus einem in der einzigen Figur dargestellen Ausführungsbeispiel. Die Figur zeigt eine schematische Darstellung einer Vorrichtung, in der das er­ findungsgemäße Verfahren durchgeführt werden kann.Further details and advantages result from one in the single figure represent embodiment. The figure shows is a schematic representation of a device in which he process according to the invention can be carried out.

Von einem Extruder 10 wird ein Schmelzestrom einem Folienblas­ kopf 12 zugeführt, aus dessen Ringdüse 14 die Schlauchfolienbase 16 austritt. Innerhalb des Folienblaskopfs sind auf Umfang ver­ teilt Heizpatronen 18 angeordnet. Um die Ringdüse 14 herum auf Umfang verteilt sitzen drei Temperaturmeßfühler 20. Die von ihnen aufgenommenen Temperaturwerte werden einem ersten Prozes­ sor A zugeleitet, in dem abgeglichen wird, ob die mittlere aufge­ nommene Temperatur der Solltemperatur, beispielsweise 250°C, entspricht. Bei festgestellten Abweichungen wird ein Regelwert zur Erhöhung oder Erniedrigung der mittleren Heizleistung und des dadurch abgegebenen Wärmestroms ausgegeben. Dies kann beispielsweise durch Abgabe eines Sollwerts S für die mittlere Einschaltdauer der Heizpatronen 18 erfolgen.From an extruder 10 , a melt stream is fed to a film blowing head 12 , from the ring nozzle 14, the tubular film base 16 emerges. Within the film die, heating cartridges 18 are arranged on the circumference ver. Around the ring nozzle 14 are distributed around the circumference three temperature sensors 20 . The temperature values recorded by them are fed to a first processor A, in which a comparison is made as to whether the mean temperature recorded corresponds to the target temperature, for example 250 ° C. If deviations are detected, a control value is issued to increase or decrease the average heating power and the heat flow emitted as a result. This can be done, for example, by supplying a target value S for the average duty cycle of the heating cartridges 18 .

Mit B ist ein Prozessor für eine Profilregelung angedeutet. Hier wird entsprechend eines aufgenommenen Profils der Dick- bzw. Dünnstellenverteilung der extrudierten Schlauchfolie ein Stell­ größenprofil ermittelt, gemäß dem in Bereichen der Dickstellen die Heizpatronen derart angesteuert werden, daß sie einen ver­ gleichsweise höheren Wärmestrom abgeben und andererseits die Heizpatronen im Bereich der Dünnstellen derart angesteuert wer­ den, daß sie einen niedrigeren Wärmestrom abgeben. Die Einstel­ lung des Wärmestroms erfolgt dabei über eine längere individuel­ le Einschaltdauer bzw. kürzere individuelle Einschaltdauer der jeweiligen Heizpatrone. Dabei wird aber die über sämtliche Heiz­ patronen gemittelte mittlere Anschaltdauer der Heizpatronen ent­ sprechend der Vorgabe des Sollwerts S für die mittlere Einschalt­ dauer des Temperaturreglers A erreicht werden.B indicates a processor for a profile control. Here according to a recorded profile the thickness or Thin point distribution of the extruded tubular film is one position size profile determined in accordance with the areas of the thick spots the heating cartridges are controlled so that they ver equally give off higher heat flow and on the other hand the Cartridges in the area of the thin spots are controlled in such a way that they give off a lower heat flow. The setting  heat flow takes place over a longer period of time le duty cycle or shorter individual duty cycle of the respective heating cartridge. But this is the over all heating cartridges averaged average activation time of the heating cartridges speaking of the specification of the setpoint S for the middle switch-on temperature controller A can be reached.

Damit wird in der Profilregelung B die Gesamtheitsleistung ent­ sprechend des ermittelten Dickenprofils auf die einzelnen Heizpa­ tronen aufgeteilt. Dabei bleibt die Summe der gesamten Einzelheiz­ leistungen konstant und entspricht dem vom Temperaturregler A ermittelten Wert. Dadurch bleibt die Düsentemperatur bei eingeschalteter Reglung konstant.The overall performance is thus achieved in profile control B. speaking of the determined thickness profile on the individual Heizpa tronen divided. The sum of the total individual heating remains outputs constant and corresponds to that of temperature controller A determined value. This keeps the nozzle temperature on Regulation constant.

Claims (5)

1. Verfahren zur Temperaturregelung eines Folienblaskopfes zur Herstellung von Kunststoff-Schlauchfolien, wobei im Folien­ blaskopf auf Umfang verteilt Heizpatronen integriert sind, gekennzeichnet durch folgende Schritte:
  • a) Aufheizen der Heizpatronen über einen ersten Regelkreis derart, daß der mittlere von ihnen abgegebene Wärme­ strom den Folienblaskopf auf eine Solltemperatur auf­ heizt und
  • b) zusätzliches individuelles Aufheizen bzw. Abkühlen der einzelnen Heizpatronen über einen zweiten Regelkreis derart, daß an singulären Stellen des Folienblaskopfes der Wärmestrom erhöht bzw. erniedrigt werden kann, um Dick- bzw. Dünnstellen der Kunststoff-Schlauchfolien auszugleichen.
1. Method for regulating the temperature of a film blowing head for the production of plastic tubular films, heating cartridges distributed over the circumference integrated in the film blowing head, characterized by the following steps:
  • a) heating the heating cartridges via a first control circuit in such a way that the average heat output by them heats the film die head to a desired temperature and
  • b) additional individual heating or cooling of the individual heating cartridges via a second control circuit in such a way that the heat flow can be increased or decreased at singular points in the film die head in order to compensate for thick or thin places in the plastic tubular films.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abgabe des Wärmestroms der einzelnen Heizpatronen über deren Einschaltdauer eingestellt wird.2. The method according to claim 1, characterized in that the Delivery of the heat flow of the individual heating cartridges via their Duty cycle is set. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Solltemperatur des Folienblaskopfes über mehrere Tem­ peraturfühler, vorzugsweise drei Temperaturfühler, die am Umfang der im Folienblaskopf integrierten Ringdüse verteilt sind, aufgenommen wird.3. The method according to claim 1 or 2, characterized in that the target temperature of the film die over several tem temperature sensor, preferably three temperature sensors, the Scope of the ring nozzle integrated in the film blowing head distributed are recorded. 4. Verfahren nach einem der Ansprüche 1-3, dadurch gekennzeich­ net, daß im zweiten Regler die Heizpatronen entsprechend dem aktuellen Dickenprofil der extrudierten Kunststoff-Schlauch­ folie angesteuert werden.4. The method according to any one of claims 1-3, characterized net that the heating cartridges in accordance with the current thickness profile of the extruded plastic hose film can be controlled. 5. Verfahren nach einem der Ansprüche 1-4, dadurch gekennzeich­ net, daß beim Aufheizen des Folienblaskopfes alle Heizpatro­ nen entsprechend ihrer maximalen Heizleistung den maximalen Wärmestrom abgeben und daß die Heizpatronen nach Erreichen der Solltemperatur des Folienblaskopfes nur während definier­ ten Einschaltzeitintervallen zur Abgabe des gewünschten Wär­ mestroms angeschaltet werden.5. The method according to any one of claims 1-4, characterized net that all Heizpatro when heating the film die head the maximum according to their maximum heating output Give off heat flow and that the heating cartridges after reaching the set temperature of the film die head only during defin ten switch-on intervals for delivering the desired heat mestroms can be switched on.
DE4236443A 1992-10-28 1992-10-28 Method for controlling the temperature of a film blowing head for the production of plastic tubular films Expired - Lifetime DE4236443B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4236443A DE4236443B4 (en) 1992-10-28 1992-10-28 Method for controlling the temperature of a film blowing head for the production of plastic tubular films

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Application Number Priority Date Filing Date Title
DE4236443A DE4236443B4 (en) 1992-10-28 1992-10-28 Method for controlling the temperature of a film blowing head for the production of plastic tubular films

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DE4236443A1 true DE4236443A1 (en) 1994-05-05
DE4236443B4 DE4236443B4 (en) 2005-02-24

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19541296A1 (en) * 1995-11-06 1997-05-07 Windmoeller & Hoelscher Device for heating the film sectors of a film tube extruded from a film blowing head
DE10242175B4 (en) * 2002-09-10 2005-01-05 Windmöller & Hölscher Kg Apparatus and process for the production of self-cleaning foils by blow molding
DE10122856B4 (en) * 2001-03-05 2006-08-10 Windmöller & Hölscher Kg Blown film die for producing tubular film from thermoplastics has inner and outer cooling rings for film which are divided into sectors which air can be blown on to film under different conditions
WO2014072090A1 (en) * 2012-11-09 2014-05-15 Windmöller & Hölscher Kg Die device for an extrusion blow-moulding apparatus for producing a multilayered blown film

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2947293C2 (en) * 1979-11-23 1983-09-15 Windmöller & Hölscher, 4540 Lengerich Process for regulating the film thickness on a blown film extruder
DE2950003C2 (en) * 1979-12-12 1983-08-11 Windmöller & Hölscher, 4540 Lengerich Process for regulating the film thickness on a blown film extruder
US4882104A (en) * 1987-04-03 1989-11-21 Cincinnati Milacron, Inc. Method of controlling the thickness of an extruded plastic article
EP0423386B1 (en) * 1989-10-17 1993-07-28 Tomi Machinery Manfuacturing Co., Ltd. Synthetic resin film, method of uniforming the film thickness upon molding of such film and apparatus therefor
DE3936239A1 (en) * 1989-10-31 1991-05-02 Windmoeller & Hoelscher RING NOZZLE FOR EXTRESS PRESSES, PREFERABLY FILM BLOW HEAD

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19541296A1 (en) * 1995-11-06 1997-05-07 Windmoeller & Hoelscher Device for heating the film sectors of a film tube extruded from a film blowing head
FR2740722A1 (en) * 1995-11-06 1997-05-09 Windmoeller & Hoelscher DEVICE FOR WARMING THE SHEET SECTIONS OF A SHEET SHEAT EXTRUDED FROM A SHEET BLOWING HEAD
DE19541296C2 (en) * 1995-11-06 1999-07-01 Windmoeller & Hoelscher Device for heating the film sectors of a film tube extruded from a film blowing head
DE10122856B4 (en) * 2001-03-05 2006-08-10 Windmöller & Hölscher Kg Blown film die for producing tubular film from thermoplastics has inner and outer cooling rings for film which are divided into sectors which air can be blown on to film under different conditions
DE10242175B4 (en) * 2002-09-10 2005-01-05 Windmöller & Hölscher Kg Apparatus and process for the production of self-cleaning foils by blow molding
WO2014072090A1 (en) * 2012-11-09 2014-05-15 Windmöller & Hölscher Kg Die device for an extrusion blow-moulding apparatus for producing a multilayered blown film
US9713896B2 (en) 2012-11-09 2017-07-25 Windmöller & Hölscher Kg Die device for an extrusion blow-moulding apparatus for producing a multilayered blown film

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