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 cartridgesInfo
- 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
- Authority
- DE
- Germany
- Prior art keywords
- heating
- temperature
- film
- heating cartridges
- head
- 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.)
- Granted
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
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
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)
- 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.
- 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.
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 true DE4236443A1 (en) | 1994-05-05 |
DE4236443B4 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 |
---|---|
DE (1) | DE4236443B4 (en) |
Cited By (4)
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)
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 |
-
1992
- 1992-10-28 DE DE4236443A patent/DE4236443B4/en not_active Expired - Lifetime
Cited By (7)
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 |
Also Published As
Publication number | Publication date |
---|---|
DE4236443B4 (en) | 2005-02-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69321618T2 (en) | WELDING METHOD FOR PRODUCING SPIRAL WINDED TUBES AND WELDING HEAD FOR IMPLEMENTING THIS METHOD | |
DE4207439B4 (en) | Foil blowing head for the production of tubular foils from thermoplastic | |
WO2002087850A1 (en) | Method and device for regulating the temperature of parisons | |
DE2126200A1 (en) | Method for volume control in extruders with multiple heads | |
DE2252084C3 (en) | Process for the production of thermoplastic films | |
DE3027200C2 (en) | Device for extruding rubber and thermally crosslinkable synthetic resins | |
DE202007014876U1 (en) | Extrusion tool with temperature control | |
DE1289297B (en) | Process and device for the continuous production of multi-layer hoses made of thermoplastics by the extrusion process | |
DE4236443A1 (en) | Temp. regulation of foil blowing head - for plastic bag foil mfr. using circuits for common and individual regulation of integrated heating cartridges | |
DE69303671T2 (en) | Intermittent heating device for plasticized fluids in injection molding or the like | |
DE2507070C2 (en) | Process for the continuous production of tubular films made of plastic | |
DE2430231A1 (en) | METHOD AND APPARATUS FOR MANUFACTURING A BLOWN FILM | |
DE2553069C3 (en) | Slot nozzle for producing a polymer film of uniform thickness | |
EP0483562A1 (en) | Method for manufacturing tubular films | |
DE1925460A1 (en) | Blown film production | |
EP0425797A1 (en) | Annular die for extrusion with application to a film extrusion blowing head | |
DE19842778A1 (en) | Tubular plastic film production involves maintaining correct film thickness by segmentally varying the internal cooling air temperature | |
EP0595037A1 (en) | Apparatus for centering a blown tubular film on a blown film extruder head | |
DE4222260A1 (en) | Prodn. of blown plastic film tubing - using blown air system to correct thickness deviations, sustaining each correction for time while shifting adjustment from one jet to another | |
DE69308876T2 (en) | METHOD FOR PRODUCING A TUBE LINING DEFORMED IN CROSS-SECTION | |
DE4132032A1 (en) | Simultaneous continuous extrusion of several thermoplastic profiles - involves common haul-off and die head with separate dies which are individually temp. controlled | |
DE102004001473A1 (en) | Extrusion head for multi-layered tubular blown film includes intermediate section prior to extrusion nozzle for heating or cooling | |
EP0723849A1 (en) | Blown film for the manufacture of tubular thermoplastic films | |
DE3120518C1 (en) | Process for producing mandrel heated hoses and device for carrying out the process | |
DE1629700C (en) | Device for the simultaneous production of several tubular blown foils |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8364 | No opposition during term of opposition | ||
R071 | Expiry of right | ||
R071 | Expiry of right |