EP4164861A1 - Blow-moulding installation and method for producing tubular plastics film - Google Patents

Blow-moulding installation and method for producing tubular plastics film

Info

Publication number
EP4164861A1
EP4164861A1 EP21734307.8A EP21734307A EP4164861A1 EP 4164861 A1 EP4164861 A1 EP 4164861A1 EP 21734307 A EP21734307 A EP 21734307A EP 4164861 A1 EP4164861 A1 EP 4164861A1
Authority
EP
European Patent Office
Prior art keywords
melt
fluid
outlet gap
plastic film
cooling tower
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.)
Pending
Application number
EP21734307.8A
Other languages
German (de)
French (fr)
Inventor
Simon HASELMANN
Michel BEMBENEK
Bernd LIESBROCK
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
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP4164861A1 publication Critical patent/EP4164861A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/27—Cleaning; Purging; Avoiding contamination
    • B29C48/272—Cleaning; Purging; Avoiding contamination of dies
    • 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
    • B29C48/27—Cleaning; Purging; Avoiding contamination
    • B29C48/274—Cleaning; Purging; Avoiding contamination of the extruded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/9125—Cooling of hollow articles of tubular films internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • 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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

Definitions

  • the invention relates to a blown film plant and a method for producing tubular plastic film
  • Such blown film systems are known, with a nozzle head, comprising an annular outlet for conveying out a plastic melt, with a take-off for withdrawing the melt and the tubular plastic film formed therefrom in one transport direction, and with a downwardly arranged in the transport direction and within the annular outlet of the nozzle head arranged cooling tower, wherein the cooling tower comprises at least one fluid outlet gap, from which a fluid can be guided in the radial direction onto the inside of the melt and / or the tubular plastic film.
  • cooling towers known as internal bubble cooling
  • this internal cooling to absorb liquid paraffin occurring during the extrusion process, which is deposited on the internal cooling, through collecting channels DE 1020 140 175 56 A1 and to discharge it through the interior of the internal cooling.
  • Such a cooling tower is disclosed in DE 10 2014017 556 A1.
  • the technical effort involved in removing liquid paraffins has proven to be disadvantageous.
  • the object of the present invention is therefore to create a blown film plant and a method which enable liquid paraffins to be removed more easily.
  • the fluid outlet gap comprises at least one interruption.
  • the fluid outlet gap is no longer circumferential, as is known from the prior art, viewed in the circumferential direction of the tubular plastic film.
  • liquid paraffin can collect at the upper edge of the fluid outlet gap, run along this edge and run down at the interruption under the influence of gravity.
  • the fluid outlet gap is inclined at an angle with respect to the transport direction, the angle being smaller or larger than 90 °. This supports the drainage of the liquid paraffin, since a flow direction is specified.
  • the fluid outlet gap overlaps itself, or if several fluid outlet gaps are provided, it becomes one The fluid outlet gap and an adjacent fluid outlet gap overlap.
  • a channel is provided above or below the fluid outlet gap, which channel can be angled downwards at the interruption.
  • Air is preferred as the fluid, so that in the following instead of the term “fluid outlet gap” the term “air outlet gap” will also be used.
  • the innovation of the concept according to the invention consists in designing the air outlet gap interrupted or segmented and, in particular, designing it as inclined slots. Continuous cooling over the entire circumference can be guaranteed without interruption. At the same time, the resulting paraffin droplets can run over the interruptions or webs through the air gap.
  • This method is characterized in that the fluid outlet gap comprises at least one interruption. This achieves the same advantages as have already been described in connection with a blown film line according to the invention.
  • FIG. 1 side view of a cooling tower of a blown film line according to the invention
  • Fig. 1 shows a cooling tower 1 of a blown film line according to the invention.
  • This additionally comprises a nozzle head 4, which brings out a tubular melt or plastic film 6 in the transport direction 6.
  • the cooling tower comprises air outlet gaps 3, from which air is given out in the radial direction in order to cool the melt or the plastic film from the inside.
  • a paraffin collecting container 2 is arranged to collect the paraffin outgassed from the melt or from the plastic film, which largely condenses on the outer surface of the cooling tower 1, and to discharge it through the nozzle head via lines not shown in detail.

Landscapes

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

Abstract

The invention describes a blow-moulding installation for producing tubular plastics film • with a die head, comprising an annular outlet for discharging a polymer melt, • with a take-off for taking off in a transporting direction the melt and the tubular plastics film forming therefrom, • with a cooling tower, arranged downstream in the transporting direction and arranged within the tubular outlet of the die head, wherein the cooling tower comprises at least one fluid-outlet gap, from which a fluid can be conducted in a radial direction onto the inner side of the melt and/or of the tubular plastics film. The fluid-outlet gap comprises at least one interruption.

Description

Blasfolienanlage sowie Verfahren zur Herstellung schlauchförmiger Kunststofffolie Blown film line and process for the production of tubular plastic film
Die Erfindung betrifft eine Blasfolienanlage sowie ein Verfahren zur Herstellung schlauchförmiger Kunststofffolie The invention relates to a blown film plant and a method for producing tubular plastic film
Bekannt sind solche Blasfolienanlagen, mit einem Düsenkopf, umfassend einen ringförmigen Auslass zum Herausfördern einer Kunststoffschmelze, mit einem Abzug zum Abziehen der Schmelze und der sich daraus bildenden schlauchförmigen Kunststofffolie in einer Transportrichtung, sowie mit einer in Transportrichtung abwärts angeordneten und innerhalb des ringförmigen Auslasses des Düsenkopfes angeordneten Kühlturms, wobei der Kühlturm wenigstens einen Fluidaustrittsspalt umfasst, aus welchem ein Fluid in radialer Richtung auf die Innenseite der Schmelze und/oder der schlauchförmigen Kunststofffolie leitbar ist. Such blown film systems are known, with a nozzle head, comprising an annular outlet for conveying out a plastic melt, with a take-off for withdrawing the melt and the tubular plastic film formed therefrom in one transport direction, and with a downwardly arranged in the transport direction and within the annular outlet of the nozzle head arranged cooling tower, wherein the cooling tower comprises at least one fluid outlet gap, from which a fluid can be guided in the radial direction onto the inside of the melt and / or the tubular plastic film.
Der Stand der Technik ist, dass Blaseninnenkühlungen bezeichnete Kühltürme über radiale Luftaustrittsspalte verfügen, welche einen gleichmäßigen Kühlluftstrom bereitstellen, um die Kunststoffschmelze beim Blasfolienextrusionsprozess zu kühlen. Des Weiteren gibt es bereits Ausführungen dieser Innenkühlungen, um während des Extrusionsprozesses auftretendes flüssiges Paraffin, welches sich auf der Innenkühlung absetzet, durch Auffangrinnen DE 1020 140 175 56 A1 aufzunehmen und durch das Innere der Innenkühlung abzuführen. Ein solcher Kühlturm ist in der DE 10 2014017 556 A1 offenbart. Als nachteilig erweist sich allerdings der technische Aufwand, der betrieben wird, um flüssige Paraffine abzuführen. The prior art is that cooling towers, known as internal bubble cooling, have radial air outlet gaps which provide a uniform flow of cooling air in order to cool the plastic melt during the blown film extrusion process. Furthermore, there are already versions of this internal cooling to absorb liquid paraffin occurring during the extrusion process, which is deposited on the internal cooling, through collecting channels DE 1020 140 175 56 A1 and to discharge it through the interior of the internal cooling. Such a cooling tower is disclosed in DE 10 2014017 556 A1. However, the technical effort involved in removing liquid paraffins has proven to be disadvantageous.
Die Aufgabe der vorliegenden Erfindung ist es daher, eine Blasfolienanlage und ein Verfahren zu schaffen, die eine einfacherer Abführung flüssiger Paraffine ermöglichen. The object of the present invention is therefore to create a blown film plant and a method which enable liquid paraffins to be removed more easily.
Erfindungsgemäß wird diese Aufgabe durch sämtliche Merkmale des Anspruchs 1 gelöst. In den abhängigen Ansprüchen sind mögliche Ausgestaltungen der Erfindung angegeben. According to the invention, this object is achieved by all of the features of claim 1. Possible configurations of the invention are specified in the dependent claims.
Gemäß der vorliegenden Erfindung ist vorgesehen, dass der Fluidaustrittspalt wenigstens eine Unterbrechung umfasst. Durch die Unterbrechung ist der Fluidaustrittsspalt nicht mehr, wie aus dem Stand der Technik bekannt, in Umfangsrichtung der schlauchförmigen Kunststofffolie gesehen, umlaufend. According to the present invention it is provided that the fluid outlet gap comprises at least one interruption. As a result of the interruption, the fluid outlet gap is no longer circumferential, as is known from the prior art, viewed in the circumferential direction of the tubular plastic film.
Dadurch kann sich flüssiges Paraffin an der oberen Kante des Fluidaustrittsspalts sammeln, entlang dieser Kante laufen und an der Unterbrechung unter Einfluss der Schwerkraft nach unten ablaufen. As a result, liquid paraffin can collect at the upper edge of the fluid outlet gap, run along this edge and run down at the interruption under the influence of gravity.
Wenn sogar in Transportrichtung der schlauchförmigen Kunststofffolie gesehen mehrere Fluidaustrittsspalte aufeinander abfolgen, ist es sogar nicht mehr notwendig, an jedem Fluidaustrittspalt Ablaufrinnen für Paraffine vorzusehen. Eine einzelne Ablaufrinne am Fuße des Kühlturms ist nun hierfür ausreichend. If a plurality of fluid outlet gaps follow one another even as seen in the transport direction of the tubular plastic film, it is even no longer necessary to provide drainage channels for paraffins at each fluid outlet gap. A single gutter at the foot of the cooling tower is now sufficient for this.
In einer vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, dass der Fluidaustrittspalt mit einem Winkel gegenüber der Transportrichtung geneigt ist, wobei der Winkel kleiner oder größer als 90° ist. Damit wird das Ablaufen des flüssigen Paraffins unterstützt, da eine Fließrichtung vorgegeben wird. In an advantageous embodiment of the invention it is provided that the fluid outlet gap is inclined at an angle with respect to the transport direction, the angle being smaller or larger than 90 °. This supports the drainage of the liquid paraffin, since a flow direction is specified.
Zweckmäßig ist es dabei, wenn sich der Fluidaustrittspalt sich selbst überlappt, oder, wenn mehrere Fluidaustrittspalte vorgesehen sind, sich ein Fluidaustrittspalt und ein benachbarter Fluidaustrittspalt sich überlappen. Dadurch kann eine Unterbrechung des Fluidstroms in Umfangsrichtung trotz Unterbrechung des Fluidaustrittsspalts vermieden werden. Um das Ablaufen des Paraffins zu erleichtern, ist es besonders vorteilhaft, dass oberhalb oder unterhalb des Fluidaustrittspalts eine Rinne vorgesehen ist, welche an der Unterbrechung nach unten abgewinkelt sein kann. „Oberhalb“, „unterhalb“ und „unten“ sind hierbei in normaler Blickrichtung zu verstehen, in der ein Beobachter die Transportrichtung von unten nach oben wahrnimmt. It is expedient here if the fluid outlet gap overlaps itself, or if several fluid outlet gaps are provided, it becomes one The fluid outlet gap and an adjacent fluid outlet gap overlap. As a result, an interruption of the fluid flow in the circumferential direction can be avoided despite the interruption of the fluid outlet gap. In order to make it easier for the paraffin to run off, it is particularly advantageous that a channel is provided above or below the fluid outlet gap, which channel can be angled downwards at the interruption. "Above", "below" and "below" are to be understood here in the normal viewing direction, in which an observer perceives the transport direction from bottom to top.
Als Fluid ist Luft bevorzugt, so dass in der Folge statt des Begriffs „Fluidaustrittsspalt“ auch der Begriff „Luftaustrittspalt“ verwendet wird. Air is preferred as the fluid, so that in the following instead of the term “fluid outlet gap” the term “air outlet gap” will also be used.
Mit anderen Worten besteht die Neuerung des erfindungsgemäßen Konzeptes darin, den Luftaustrittspalt unterbrochen bzw. segmentiert auszuführen und insbesondere als schräge Schlitze auszuführen. Dabei kann eine über den Umfang durchgängige Kühlung ohne Unterbrechung gewährleistet werden. Gleichzeitig können entstehende Paraffintropfen über die Unterbrechungen bzw. Stege durch den Luftspalt laufen. In other words, the innovation of the concept according to the invention consists in designing the air outlet gap interrupted or segmented and, in particular, designing it as inclined slots. Continuous cooling over the entire circumference can be guaranteed without interruption. At the same time, the resulting paraffin droplets can run over the interruptions or webs through the air gap.
Zudem ist es bei diesem System im Vergleich zu bestehenden Systemen möglich auch den untersten Luftaustrittsspalt segmentiert auszuführen, sodass zusätzlich der Isolierspalt als Auffanggefäß genutzt werden kann. Versuche habe gezeigt, dass mit der Erfindung ein konstantes Abfließen und Auffangen der flüssigen Paraffine bei laufender Maschine und gleichbleibender Kühlleistung möglich ist, wodurch die paraffinablagerungsbedingte Standzeit der Maschine deutlich verlängert wird. Das bedeutet, dass Produktionsunterbrechungen zu Reinigungszwecken deutlich seltener sind als bei Anlagen des Standes der Technik. Hinzu kommt eine einfachere Fertigung, bei der auf mehrere Bauteile, welche durch Zerspanung gefertigt werden, verzichtet werden kann. Dies führt zu verringerten Herstellungskosten. Die oben genannte Aufgabe wird auch gelöst durch ein Verfahren zur Herstellung schlauchförmiger Kunststofffolie mit einer Blasfolienanlage, bei demIn addition, with this system, compared to existing systems, it is also possible to design the lowest air outlet gap in a segmented manner, so that the insulating gap can also be used as a collecting vessel. Tests have shown that the invention enables constant drainage and collection of the liquid paraffins while the machine is running and with constant cooling performance, which significantly extends the machine's service life due to paraffin deposits. This means that interruptions in production for cleaning purposes are significantly less frequent than with state-of-the-art systems. In addition, there is a simpler production, in which several components, which are manufactured by machining, can be dispensed with. This leads to a reduced manufacturing cost. The above-mentioned object is also achieved by a method for producing tubular plastic film with a blown film plant, in which
• aus einem ringförmigen Auslass eines Düsenkopfes der Blasfolienanlage eine Kunststoffschmelze herausgefördert wird, · mit einem Abzug die Schmelze und die sich daraus bildenden schlauchförmigen Kunststofffolie in einer Transportrichtung abgezogen wird, • a plastic melt is conveyed out of an annular outlet of a nozzle head of the blown film system,
• mit einer in Transportrichtung abwärts angeordneten und innerhalb des ringförmigen Auslasses des Düsenkopfes angeordneten Kühlturms mit wenigstens einem Fluidaustrittsspalt ein Fluid in radialer Richtung auf die• with a cooling tower arranged downwards in the transport direction and arranged inside the annular outlet of the nozzle head with at least one fluid outlet gap, a fluid in the radial direction onto the
Innenseite der Schmelze und/oder der schlauchförmigen Kunststofffolie geleitet wird. Inside the melt and / or the tubular plastic film is passed.
Dieses Verfahren zeichnet sich dadurch aus, dass der Fluidaustrittspalt wenigstens eine Unterbrechung umfasst. Damit werden die gleichen Vorteile erzielt, wie sie bereits im Zusammenhang mit einer erfindungsgemäßen Blasfolienanlage beschrieben worden sind. This method is characterized in that the fluid outlet gap comprises at least one interruption. This achieves the same advantages as have already been described in connection with a blown film line according to the invention.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung gehen aus der nachfolgenden Beschreibung hervor, in der unter Bezugnahme auf die Figuren verschiedene Ausführungsbeispiele im Einzelnen erläutert sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder beliebige Kombinationen erwähnter Merkmale erfindungswesentlich sein. Im Rahmen der gesamten Offenbarung gelten Merkmale und Einzelheiten, die im Zusammenhang mit dem erfindungsgemäßen Verfahren beschrieben sind, selbstverständlich auch im Zusammenhang mit der erfindungsgemäßen Blasfolienanlage und jeweils umgekehrt, so dass bezüglich der Offenbarung zu den einzelnen Aspekten der Erfindung stets wechselseitig Bezug genommen wird beziehungsweise werden kann. Die einzelnen Figuren zeigen: Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are explained in detail with reference to the figures. The features mentioned in the claims and in the description can be essential to the invention individually or in any combination of the features mentioned. In the context of the entire disclosure, features and details that are described in connection with the method according to the invention naturally also apply in connection with the blown film line according to the invention and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is or will always be made to each other can. The individual figures show:
Fig. 1 Seitenansicht eines Kühlturms einer erfindungsgemäßen Blasfolienanlage Fig. 1 zeigt einen Kühlturm 1 einer erfindungsgemäßen Blasfolienanlage. Diese umfasst zusätzlich einen Düsenkopf 4, welche in Transportrichtung 6 eine schlauchförmige Schmelze bzw. Kunststofffolie 6 herausbringt. Der Kühlturm umfasst Luftaustrittspalte 3, woraus Luft in radialer Richtung nach außen gegeben wird, um die Schmelze bzw. die Kunststofffolie von innen her zu kühlen. Am Fuß des Kühlturms 1 ist ein Paraffinauffangbehälter 2 angeordnet, um das von der Schmelze bzw. von der Kunststofffolie ausgegaste Paraffin, welches größtenteils auf der Außenoberfläche des Kühlturms 1 kondensiert, zu sammeln und über nicht näher dargestellte Leitungen durch den Düsenkopf hindurch abzuführen. Fig. 1 side view of a cooling tower of a blown film line according to the invention Fig. 1 shows a cooling tower 1 of a blown film line according to the invention. This additionally comprises a nozzle head 4, which brings out a tubular melt or plastic film 6 in the transport direction 6. The cooling tower comprises air outlet gaps 3, from which air is given out in the radial direction in order to cool the melt or the plastic film from the inside. At the foot of the cooling tower 1, a paraffin collecting container 2 is arranged to collect the paraffin outgassed from the melt or from the plastic film, which largely condenses on the outer surface of the cooling tower 1, and to discharge it through the nozzle head via lines not shown in detail.

Claims

Patentansprüche Claims
1. Blasfolienanlage zur Herstellung schlauchförmiger Kunststofffolie 1. Blown film line for the production of tubular plastic film
• mit einem Düsenkopf, umfassend einen ringförmigen Auslass zum Her ausfördern einer Kunststoffschmelze, • with a nozzle head, comprising an annular outlet for delivering a plastic melt,
• mit einem Abzug zum Abziehen der Schmelze und der sich daraus bil denden schlauchförmigen Kunststofffolie in einer Transportrichtung,• with a take-off for drawing off the melt and the tubular plastic film formed from it in one transport direction,
• mit einer in Transportrichtung abwärts angeordneten und innerhalb des ringförmigen Auslasses des Düsenkopfes angeordneten Kühlturms, wo bei der Kühlturm wenigstens einen Fluidaustrittsspalt umfasst, aus wel chem ein Fluid in radialer Richtung auf die Innenseite der Schmelze und/oder der schlauchförmigen Kunststofffolie leitbar ist, dadurch gekennzeichnet, dass der Fluidaustrittspalt wenigstens eine Unterbrechung umfasst. • with a cooling tower arranged downwards in the transport direction and arranged within the annular outlet of the nozzle head, where the cooling tower comprises at least one fluid outlet gap from which a fluid can be conducted in the radial direction to the inside of the melt and / or the tubular plastic film, characterized that the fluid outlet gap comprises at least one interruption.
2. Blasfolienanlage nach Anspruch 1 , dadurch gekennzeichnet, dass der Fluidaustrittspalt mit einem Winkel gegenüber der Transportrichtung geneigt ist, wobei der Winkel kleiner oder größer als 90 ° ist. 2. Blown film line according to claim 1, characterized in that the fluid outlet gap is inclined at an angle with respect to the transport direction, the angle being smaller or larger than 90 °.
3. Verfahren zur Herstellung schlauchförmiger Kunststofffolie mit einer Blasfolien anlage, wobei 3. A method for producing tubular plastic film with a blown film system, wherein
• aus einem ringförmigen Auslass eines Düsenkopfes der Blasfolienanlage eine Kunststoffschmelze herausgefördert wird, • from an annular outlet of a nozzle head of the blown film line a plastic melt is conveyed out,
• mit einem Abzug die Schmelze und die sich daraus bildenden schlauch förmigen Kunststofffolie in einer Transportrichtung abgezogen wird,• the melt and the tubular plastic film formed from it is withdrawn in one transport direction with a pull-off,
• mit einer in Transportrichtung abwärts angeordneten und innerhalb des ringförmigen Auslasses des Düsenkopfes angeordneten Kühlturms mit wenigstens einem Fluidaustrittsspalt ein Fluid in radialer Richtung auf die Innenseite der Schmelze und/oder der schlauchförmigen Kunststofffolie geleitet wird, dadurch gekennzeichnet, dass der Fluidaustrittspalt wenigstens eine Unterbrechung umfasst. • with a cooling tower with at least one fluid outlet gap arranged downwards in the transport direction and arranged inside the annular outlet of the nozzle head, a fluid is guided in the radial direction onto the inside of the melt and / or the tubular plastic film, characterized in that the fluid outlet gap comprises at least one interruption.
EP21734307.8A 2020-06-15 2021-06-15 Blow-moulding installation and method for producing tubular plastics film Pending EP4164861A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020207389 2020-06-15
PCT/EP2021/066115 WO2021255026A1 (en) 2020-06-15 2021-06-15 Blow-moulding installation and method for producing tubular plastics film

Publications (1)

Publication Number Publication Date
EP4164861A1 true EP4164861A1 (en) 2023-04-19

Family

ID=76601203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21734307.8A Pending EP4164861A1 (en) 2020-06-15 2021-06-15 Blow-moulding installation and method for producing tubular plastics film

Country Status (2)

Country Link
EP (1) EP4164861A1 (en)
WO (1) WO2021255026A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3655846A (en) * 1969-04-28 1972-04-11 Kohjin Co Method and apparatus for making tubular film
JPS5146529B2 (en) * 1972-09-12 1976-12-09
US4265853A (en) * 1979-09-14 1981-05-05 The Dow Chemical Company Method and apparatus for forming of reinforced tube
BRPI0515572A (en) * 2004-09-22 2008-07-29 Pack Ii Kft Dr apparatus and process for producing extruded plastic sheet hose
GB201318252D0 (en) * 2013-10-15 2013-11-27 Ap Plastics Ltd Blown film extrusion system and process
DE102014017556B4 (en) 2014-11-28 2019-05-16 Hosokawa Alpine Aktiengesellschaft Internal cooling tower for blown film systems

Also Published As

Publication number Publication date
WO2021255026A1 (en) 2021-12-23

Similar Documents

Publication Publication Date Title
DE69733160T2 (en) Device for separating impurities from a cooling liquid in a machine tool
DE102009018000B4 (en) Separator for separating liquid droplets from an aerosol
DE2029721A1 (en) Cartridge for combining fine oil droplets
DE1696004A1 (en) Method and device for piecing threads in the manufacture of threads from glass or other thermoplastic materials
DE102014017556B4 (en) Internal cooling tower for blown film systems
WO2017167458A1 (en) Wound heat exchanger
EP2525002B1 (en) Pipe branch section for downpipes
EP4164861A1 (en) Blow-moulding installation and method for producing tubular plastics film
DE102004044399A1 (en) Apparatus for cleaning lubricant for dry-type wire drawing comprises case with holes for passing steel wire, rotating members connected to driving motors by belts to rotate motors and cleaning members coupled to rotating member
WO1999039096A1 (en) Material feed container, especially for thick matter pumps
EP2170606B1 (en) Filtration for printing presses
DE4334405C2 (en) Transport device
EP3025845B1 (en) Internal cooling tower for a film blowing apparatus
DE102020127066A1 (en) CALIBRATION BASKET FOR BLOW FILM PLANT
WO2018024267A1 (en) Multi-layer blowing head for a blown film installation, blown film installation, and method for operating a blown film installation
DE202006007164U1 (en) Device for receiving and transporting chip-contaminated cooling lubricant
WO2001019581A1 (en) Device for feeding strands of molten synthetic material that are issued from nozzles to a discharge chute
EP0910445B1 (en) Fluid-distributor for a substance-exchange column
EP2611513B9 (en) Fluid degassing device and method for degassing fluids
DE10210847B4 (en) Distribution plates for distributing melts from the center to the individual layers in coextrusion blowing heads
EP2429725A1 (en) Device for removing residues from the surface of a moving strip, and strip processing system
AT405948B (en) SPIDER NOZZLE
DE102004018341A1 (en) Fluid distribution system, especially for use in rectifying columns for low temperature air storage systems, vertical guide plates with pockets at top (12) which prevent fluid from losing contact with them
DE102007000779A1 (en) Device for applying a liquid to pasty application medium onto a machine for the production and/or conversion of moving paper-, cardboard- or other fibrous-material web, comprises curtain application nozzles, and a sliding plate
DE102006041353A1 (en) Roll bending machine for the production of conical sheet metal bodies, comprises top roller, bottom roller and side rollers having multi cylindrical roller sections, which are movably separated from each other

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230116

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)