DE4236443B4 - Method for controlling the temperature of a film blowing head for the production of plastic tubular films - Google Patents
Method for controlling the temperature of a film blowing head for the production of plastic tubular films Download PDFInfo
- Publication number
- DE4236443B4 DE4236443B4 DE4236443A DE4236443A DE4236443B4 DE 4236443 B4 DE4236443 B4 DE 4236443B4 DE 4236443 A DE4236443 A DE 4236443A DE 4236443 A DE4236443 A DE 4236443A DE 4236443 B4 DE4236443 B4 DE 4236443B4
- Authority
- DE
- Germany
- Prior art keywords
- heating
- blowing head
- film blowing
- temperature
- heating cartridges
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control 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
- G05D23/1932—Control 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
- G05D23/1934—Control 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
-
- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle 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
- 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
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/865—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
- B29C48/25—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
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/87—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
- B29C48/92—Measuring, controlling or regulating
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- 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
- B29C2948/92609—Dimensions
- B29C2948/92647—Thickness
-
- 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
- B29C2948/92704—Temperature
-
- 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
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle 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
- B29C2948/92923—Calibration, after-treatment or cooling zone
Abstract
Verfahren
zur Temperaturregelung eines Folienblaskopfes zur Herstellung von
Kunststoff-Schlauchfolien, wobei im Folienblaskopf auf Umfang verteilt
Heizpatronen aufgeheizt werden,
gekennzeichnet durch folgende
Schritte:
a) Aufheizen der Heizpatronen über einen ersten Regelkreis
derart, daß der
mittlere von ihnen abgegebene Wärmestrom
den Folienblaskopf auf eine Solltemperatur aufheizt 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,
wobei die Gesamtheizleistung entsprechend des ermittelten Dickenprofils
auf die einzelnen Heizpatronen aufgeteilt wird.Method for controlling the temperature of a film blowing head for the production of plastic tubular films, heating cartridges being heated in the film blowing head distributed over the circumference,
characterized by the following steps:
a) heating of the heating cartridges via a first control loop such that the average heat flow emitted by them heats the film blowing head to a desired temperature and
b) additional individual heating or cooling of the individual heating cartridges via a second control loop such that at singular points of the film blowing head, the heat flow can be increased or decreased to compensate for thick or thin areas of the plastic tubular film, the Gesamtheizleistung corresponding to the determined Thickness profile is divided on the individual cartridge heaters.
Description
Die Erfindung betrifft ein Verfahren zur Temperaturregelung eines Folienblaskopfes zur Herstellung von Kunststoff-Schlauchfolien nach dem Oberbegriff des Anspruchs 1.The The invention relates to a method for controlling the temperature of a film blowing head for the production of plastic tubular films according to the preamble of claim 1.
Folienblasköpfe zur Herstellung von Schlauchfolien aus thermoplastischen Kunststoffen bestehen in der Regel aus einem Innenring oder aus einem inneren Kern und einem Außenring, zwischen denen ein ringförmiger Düsenspalt gebildet ist.Foil blowing heads for Production of tubular films made of thermoplastic materials usually from an inner ring or from an inner core and an outer ring, between which a ring-shaped die gap is formed.
Derartige
Kunststoffblasfolienköpfe
sind beispielsweise aus der
Um im Blasverfahren hergestellte Schlauchfolien mit über den Umfang gleicher Foliendicke herzustellen, ist es erforderlich, die Massetemperatur der Kunststoffschmelze in dem ringförmigen Düsenspalt der Extrusionsdüse einstellen zu können, um durch entsprechende Änderung der Viskosität den Fluß der austretenden Kunststoffschmelze beeinflussen zu können.Around Blown tubular films with over the To produce the same thickness of film, it is necessary to Melt temperature of the plastic melt in the annular nozzle gap the extrusion nozzle to be able to adjust by appropriate change the viscosity the river of To be able to influence exiting plastic melt.
Die bekannten Folienblasköpfe weisen einerseits eine Außenbeheizung zum Aufheizen des Folienblaskopfes auf die Arbeitstemperatur 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 Ringdüse in der gewünschten Weise ändern zu können. Bei den bekannten 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 abführen können. Alternativ dazu ist es aber auch schon bekannt, im Innen- und/oder Außenring auf den Umfang verteilt in entsprechenden Bohrungen oder Aussparungen elektrische Heizpatronen einzusetzen.The known film blowing heads on the one hand have an external heating for heating the film blowing head to the working temperature of for example, about 250 ° C on. additionally are within the Folienblaskopfes tempering or Temperiersektoren with channels or holes provided by the example, a cooling or warming Medium can be directed to increase or decrease accordingly Lowering the temperature of the respective tempering sector the temperature profile over the Circumference of the film blowing head and thus over the circumference of the annular nozzle in the desired Change way to be able to. In the known ring nozzles is the cooling or warming Medium from air, oil or other liquid or gaseous Substances which can supply heat to the tempering sectors or dissipate heat therefrom. alternative but it is also already known, in the inner and / or outer ring distributed on the circumference in corresponding holes or recesses to use electric heating cartridges.
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 Düsentemperatursollwerten abweichende Werte auftreten.at This known heating of Folienblasköpfen it comes to interactions between the heating control circuit for the external heating and the so-called Profile control loop for the arranged on perimeter heating cartridges. The separate thickness control the heating cartridges can cause that of the nozzle temperature setpoints deviating values occur.
Aufgabe der vorliegenden Erfindung ist es, diese Wechselwirkungen zu vermeiden und ein vereinfachtes Temperaturregelverfahren für einen Folienblaskopf an die Hand zu geben.task The object of the present invention is to avoid these interactions and a simplified temperature control method for a film blowing head to the To give a hand.
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:
- a) Aufheizen der Heizpatronen über einen ersten Regelkreis derart, daß der mittlere von ihnen abgegebene Wärmestrom den Folienblaskopf auf eine Solltemperatur aufheizt und
- 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 auszugleichen, wobei die Gesamtheizleistung entsprechend des ermittelten Dickenprofils auf die einzelnen Heizpatronen aufgeteilt wird.
- a) heating of the heating cartridges via a first control loop such that the average heat flow emitted by them heats the film blowing head to a desired temperature and
- b) additional individual heating or cooling of the individual heating cartridges via a second control loop such that at singular points of the film blowing head, the heat flow can be increased or decreased to compensate for thick or thin areas of the plastic films, the total heating power according to the determined thickness profile the individual cartridge heaters is divided.
Der entscheidende Vorteil dieses Verfahrens liegt darin, daß keine zusätzliche Energie für die Profilregelung eingespeist werden muß, da die ohnehin benötigte Heizleistung zur Düsentemperaturregelung derart verteilt wird, daß das Dickenprofil vergleichmäßigt wird.Of the decisive advantage of this method is that no additional Energy for the profile control must be fed, since the already required heating power for nozzle temperature control in such a way it is distributed that the Thickness profile is evened out.
Die Abgabe des Wärmestroms, der von den einzelnen Heizpatronen abgegeben wird, kann über deren Einschaltdauer eingestellt werden. Alternativ dazu könnte der Wärmestrom auch durch Drosselung der Stromzufuhr an die Heizpatronen geregelt werden.The Release of the heat flow, which is discharged from the individual cartridge heaters can on their Duty cycle can be set. Alternatively, the heat flow be regulated by throttling the power to the heating cartridges.
Die Solltemperatur des Folienblaskopfes kann über mehrere Temperaturfühler am Umfang der im Folienblaskopf integrierten Ringdüse verteilt aufgenommen werden. Mit drei Temperaturfühlern, die auf Umfang verteilt sind, können gute Regelergebnisse erzielt werden.The Target temperature of the film blowing head can be controlled by several temperature sensors on Scope of the integrated in the film blowing head annular nozzle distributed. With three temperature sensors, which are distributed on a scale, can good rule results are achieved.
Der zweite Regelkreis, d.h. der sogenannte Profilregelkreis kann die Heizpatronen entsprechend dem aktuellen Dickenprofil der extrudierten Kunststoff-Schlauchfolie ansteuern.Of the second control loop, i. the so-called profile control loop can the Cartridge heaters according to the current thickness profile of the extruded Activate plastic tubular film.
Beim Aufheizen des Folienblaskopfes können alle Heizpatronen entsprechend ihrer maximalen Heizleistung den maximalen Wärmestrom abgeben und nach Erreichen der Solltemperatur können die Heizpatronen während definierter Einschaltzeitintervalle zur Abgabe des gewünschten Wärmestroms angeschaltet werden.When heating the Folienblaskopfes all cartridge heaters can deliver the maximum heat flow according to their maximum heat output and after reaching the desired temperature, the heating cartridges can be turned on during defined Einschaltzeitintervalle to deliver the desired heat flow.
Weitere Einzelheiten und Vorteile ergeben sich aus einem in der einzigen Figur dargestellten Ausführungsbeispiel. Die Figur zeigt eine schematische Darstellung einer Vorrichtung, in der das erfindungsgemäße Verfahren durchgeführt werden kann.Further Details and benefits emerge from one in the only one Figure illustrated embodiment. The figure shows a schematic representation of a device, in the inventive method carried out can be.
Von
einem Extruder
Mit B ist ein Prozessor für eine Profilregelung angedeutet. Hier wird entsprechend eines aufgenommenen Profils der Dick- bzw. Dünnstellenverteilung der extrudierten Schlauchfolie ein Stellgrößenprofil ermittelt, gemäß dem in Bereichen der Dickstellen die Heizpatronen derart angesteuert werden, daß sie einen vergleichsweise höheren Wärmestrom abgeben und andererseits die Heizpatronen im Bereich der Dünnstellen derart angesteuert werden, daß sie einen niedrigeren Wärmestrom abgeben. Die Einstellung des Wärmestroms erfolgt dabei über eine längere individuelle Einschaltdauer bzw. kürzere individuelle Einschaltdauer der jeweiligen Heizpatrone. Dabei wird aber die über sämtliche Heizpatronen gemittelte mittlere Einschaltdauer der Heizpatronen entsprechend der Vorgabe des Sollwerts S für die mittlere Einschaltdauer des Temperaturreglers A erreicht werden.With B is a processor for indicated a profile control. Here is recorded according to a Profile of the thick or thin distribution of the extruded tubular film determined a manipulated variable profile, according to the Areas of the thick places the heating cartridges are driven in such a way that she a comparatively higher one heat flow and on the other hand, the heating cartridges in the thin areas be driven so that they a lower heat flow submit. The adjustment of the heat flow takes place via a longer one individual duty cycle or shorter individual duty cycle the respective heating cartridge. But this is the average over all heating cartridges Average duty cycle of the heating cartridges according to the specification of the setpoint S for the average duty cycle of the temperature controller A can be achieved.
Damit wird in der Profilregelung B die Gesamtheizleistung entsprechend des ermittelten Dickenprofils auf die einzelnen Heizpatronen aufgeteilt. Dabei bleibt die Summe der gesamten Einzelheizleistungen konstant und entspricht dem vom Temperaturregler A ermittelten Wert. Dadurch bleibt die Düsentemperatur bei eingeschalteter Regelung konstant.In order to is in the profile control B, the total heating power accordingly of the determined thickness profile divided among the individual heating cartridges. there the sum of the total individual heating powers remains constant and corresponds to the value determined by the temperature controller A. Thereby the nozzle temperature remains constant when the control is switched on.
Claims (5)
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 |
Applications Claiming Priority (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 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE4236443A1 DE4236443A1 (en) | 1994-05-05 |
DE4236443B4 true DE4236443B4 (en) | 2005-02-24 |
Family
ID=6471589
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4236443A Expired - Lifetime 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 |
Country Status (1)
Country | Link |
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DE (1) | DE4236443B4 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
DE102013100938A1 (en) * | 2012-11-09 | 2014-05-15 | Windmöller & Hölscher Kg | Nozzle device for a bubble extrusion device for producing a multilayer blown film |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2140194B2 (en) * | 1971-08-11 | 1975-06-12 | Basf Ag | Rfng nozzle for extrusion presses |
DE2950003C2 (en) * | 1979-12-12 | 1983-08-11 | Windmöller & Hölscher, 4540 Lengerich | Process for regulating the film thickness on a blown film extruder |
DE2947293C2 (en) * | 1979-11-23 | 1983-09-15 | Windmöller & Hölscher, 4540 Lengerich | Process for regulating the film thickness on a blown film extruder |
EP0287551A1 (en) * | 1987-04-03 | 1988-10-19 | Cincinnati Milacron Inc. | Method of controlling the thickness of an extruded plastic article |
EP0423386A1 (en) * | 1989-10-17 | 1991-04-24 | 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 |
-
1992
- 1992-10-28 DE DE4236443A patent/DE4236443B4/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2140194B2 (en) * | 1971-08-11 | 1975-06-12 | Basf Ag | Rfng nozzle for extrusion presses |
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 |
EP0287551A1 (en) * | 1987-04-03 | 1988-10-19 | Cincinnati Milacron Inc. | Method of controlling the thickness of an extruded plastic article |
EP0423386A1 (en) * | 1989-10-17 | 1991-04-24 | 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 |
Also Published As
Publication number | Publication date |
---|---|
DE4236443A1 (en) | 1994-05-05 |
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---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8364 | No opposition during term of opposition | ||
R071 | Expiry of right | ||
R071 | Expiry of right |