DE2062510A1 - Tempering and setting appts - for low pressure polyethylene blown film tubing - Google Patents

Tempering and setting appts - for low pressure polyethylene blown film tubing

Info

Publication number
DE2062510A1
DE2062510A1 DE19702062510 DE2062510A DE2062510A1 DE 2062510 A1 DE2062510 A1 DE 2062510A1 DE 19702062510 DE19702062510 DE 19702062510 DE 2062510 A DE2062510 A DE 2062510A DE 2062510 A1 DE2062510 A1 DE 2062510A1
Authority
DE
Germany
Prior art keywords
cooling
cylinder
air
film
pressure polyethylene
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
DE19702062510
Other languages
German (de)
Inventor
Der Anmelder Ist
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19702062510 priority Critical patent/DE2062510A1/en
Publication of DE2062510A1 publication Critical patent/DE2062510A1/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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • 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
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • 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
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • 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
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

An air cooled cylinder of heat conducting material is arranged directly adjacent to the blow head. Pref. the cylinder material is a perforated Al sheet surrounded by an outer jacket forming an annulus through which adjustable amounts of air can flow producing completely uniform cooling whilst maintaining a symmetrical shape to the film.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum Abkühlen und gleichzeitigem Fixieren einer nach dem Blasverfahren erzeugten Folie; sie bezieht sich vorzugsweise auf die Herstellung von papierähnlichen Kunststoffolien.The present invention relates to a device for cooling and simultaneous fixing of a film produced by the blown process; she relates preferably on the production of paper-like plastic films.

Es ist bekannt, thermoplastische Kunststoffolien, z.B.It is known to use thermoplastic plastic films, e.g.

glasklares Polypropylen, nach dem Aufblasen der aus Ringachlitzdüsen extrudierten Schläuche in zylinderförmigen Kühleinrichtungen, die mit Kühlflüssigkeit benetzt sind, abzukühlen und zu fixieren. Es ist weiterhin bekannt, papierähnliche Kunststoffolie, die vorzugsweise aus im Niederdruckverfahren hergestellten Polyäthylen erzeugt wird, unmittelbar nach dem Aufblasen in einer verstellbaren Leitplattenvorrichtung auf zunehmen und in einem flachgelegten Schlauch umzuformen.crystal clear polypropylene, after inflating the from Ringachlitz nozzles extruded hoses in cylindrical cooling devices with cooling liquid are wetted to cool and fix. It is also known to be paper-like Plastic film, which is preferably made from low-pressure polyethylene is generated immediately after inflation in an adjustable baffle device to increase and to reshape in a flat tube.

Die bekann#Vorrichtung einer zylindrischen flüssigkeitsgekühlten Fixierung für Polypropylen hat den Nachteil, daß damit die Dickenverteilung der Folie infolge von zu schneller Abschreckung Jeweils an der Stelle des Schlauchumfanges an der die Blase zuerst an die Wand gelangt, sehr ungleichmäßig wird. Außerdem ist ein erheblicher Aufwand für die gleich -mäßige Zu- und Abfuhr der Kühlflüssigkeit erforderlich. Die heute übliche Methode der Schlauchfixierung durch verstellbare Leitplatten bei der Herstellung von papierähnlicher Folie hat den Nachteil, daß die Blase unmittelbar nach dem Aufblasen des Schlauches quadratisch oder rechteckig de -formiert wird, damit erhalten die von einem rohrförmig runden Körper ausgehende Verzugslinien verschiedene Längen, wodurch die Dickenverteilung der Folie schlecht zu beherrschen ist.The known device of a cylindrical liquid-cooled fixation for polypropylene has the disadvantage that the thickness distribution of the film as a result of too quick deterrence In each case at the point of the hose circumference at the when the bladder hits the wall first, it becomes very uneven. Also is a considerable effort is required for the uniform supply and removal of the cooling liquid. The now common method of hose fixation by means of adjustable guide plates the production of paper-like film has the disadvantage that the bubble immediately is deformed into a square or rectangular shape after inflation of the tube, This gives the warpage lines starting from a tubular, round body different ones Lengths, making the thickness distribution of the film difficult to control.

Weiterhin sind die Kühlverhältnisse ungleich, da die Folie am Umfang des geblasenen Schlauches nur stellenweise an den Leitplatten zur Anlage kommt. Die Folge davon sind Falten beim Aufwickeln und seitlicher Verlust der Folienbahn auf der Rolle.Furthermore, the cooling conditions are unequal because the film is on the circumference of the blown hose only comes to rest against the guide plates in places. The consequence of this is wrinkles during winding and lateral loss of the film web on the roll.

Diesen bekannten Nachteilen gegenüber bietet die vorliegende Erfindung den Vorteil einer gemäßigten Abschreckung und der Beibehaltung einer rotationssymmetrischen Form der Blase, bei der Jede Fließlinie von der Ringschlitzdüse des Blaskopfes bis zur erstarrten Folie an der Wand des Kühlzylinders gleiche Länge aufweist, und damit die Abkühlverhältnisse in Jedem Stromfaden gleich sind. Weiterhin bietet die vorgeschlagene Vor -richtung. dea Vorteil, daß durch eine gesteuerte Abkühlwirkung Glanz und Festigkeit der Fertigware verändert werden können.The present invention offers these known disadvantages the advantage of a moderate deterrent and the retention of a rotationally symmetrical one Shape of the bubble in which any flow line from the ring slot nozzle of the blow head to has the same length as the solidified film on the wall of the cooling cylinder, and thus the cooling conditions in each stream filament are the same. Furthermore, the proposed Contraption. The advantage of a controlled cooling effect is that it provides gloss and strength the finished product can be changed.

Zur Erzielung dieser Verhältnisse wird eine KWhl~ und Fixiervorrichtung vorgeschlagen, die mit einem Zylinder aus wärmeleitendem Material - vorzugsweise gelochtes Aluminiumblech -besteht, der von außen mit Luft abgekühlt wird. Der Kühlluft -strom ist einstellbar und soll vorzugsweise so einreguliert werden, daß der Zylinder an der Stelle an der die Folie die Wand berührt, eine Temperatur zwischen 40Q und 900 C, je nach verwendetem Folienrohstoff, erreicht. In Sonderfällen kann dieser Wert auch ohne zusätzliche Luftkühlung, also nur durch die umgebende Raumluft, erreicht werden.To achieve this, a cooling and fixing device is used proposed that with a cylinder made of thermally conductive material - preferably perforated aluminum sheet - is made, which is cooled from the outside with air. The cooling air current is adjustable and should preferably be adjusted so that the cylinder at the point where the film touches the wall, a temperature between 40 ° C and 900 C, depending on the film raw material used. In special cases this can Value achieved even without additional air cooling, i.e. only through the surrounding room air will.

Figur 1 zeigt die erfindungsgemäße Anordnung im Längsschnitt.Figure 1 shows the arrangement according to the invention in longitudinal section.

Aus dem Folienblaskopf 1 tritt der Kunststoff röhrenförmig aus und wird durch Innenluftdruck soweit aufgeweitet, bis er bei 3 an die Innenwand des Kalibrierzylinders 4 gelangt. Um den-Kalibrierzylinder ist der Leitmantel 5 angeor4net, durch den in Pfeilrichtung 6 Luft oder anderes Gas zwischen Innen- und Außenzylinder hindurch geführt wird, welches bei 7-wieder austritt. Der Luftstrom kann durch Drosseln des vorgeschalteten Gebläses auf eine Luftmenge eingestellt werden, die bei 3 eine Je nach der gewünschten Trübung der Folie höhere oder niedrigere Temperatur ( vorzugsweise zwischen 400 und 900 C, gemessen an der Außenseite des inneren Zylinders ) verursacht.The plastic emerges from the film blow head 1 in a tubular shape is expanded by internal air pressure until it hits the inner wall of the at 3 Calibration cylinder 4 arrives. The guide jacket 5 is arranged around the calibration cylinder, through the air or other gas between the inner and outer cylinders in the direction of the arrow 6 is passed through, which exits again at 7-. The air flow can be reduced by throttling of the upstream fan can be set to an amount of air that is at 3 a Depending on the desired cloudiness of the film, higher or lower temperature (preferably between 400 and 900 C, measured on the outside of the inner cylinder).

Claims (5)

Patent - Ansprüche Patent Claims ================== Vorrichtung zum Kühlen und Fixieren einer geblasenen thermoplastischen Folie, vorzugsweise papierähnlicher Folie, aus Niederdruck-Polyäthylen, gekennzeichnet durch einen luftgekühlten Zylinder aus wärmeleitendem Material, angeordnet in einem Bereich unmittelbar nach dem Blaskopf. ================== Device for cooling and fixing a blown thermoplastic film, preferably paper-like film, made of low-pressure polyethylene, characterized by an air-cooled cylinder made of thermally conductive material in an area immediately after the die. 2) Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Kühl- und Fixierzylinder von einem Außenmantel umgeben wird, der einen kreisring-zylindrischen Raum bildet, durch den Kühlluft in einstellbaren Mengen hindurch fließt.2) Device according to claim 1, characterized in that the cooling and fixing cylinder is surrounded by an outer jacket, which is a circular ring-cylindrical Forms space through which cooling air flows in adjustable quantities. 3) Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Zylindermaterial ein gelochtes Aluminiumblech verwendet wird.3) Device according to claim 1, characterized in that the cylinder material a perforated aluminum sheet is used. 4) Vorrichtung nach Anspruch 1 und 3, dadurch gekennzeichnet, daß der Zylinder ohne zusätzliche Luftkuhlung angeordnet wird, wodurch nur die umgebende Raumluft der Wärmeablei -tung dient.4) Device according to claim 1 and 3, characterized in that the cylinder is arranged without additional air cooling, reducing only the surrounding Room air serves to dissipate heat. 5) Vorrichtung nach Anspruch 1, 3 und 4, dadurch gekennzeichnet, daß .zwischen Blaskopf und Kühlzylinder ein Luftkühlring in bekannter Weise angeordnet ist, aus dem ein rotationssymmetrischer Luftstrahl auf die sich ausweitende Kunststofibläse geführt wird.5) Device according to claim 1, 3 and 4, characterized in that . Between the blow head and the cooling cylinder, an air cooling ring is arranged in a known manner is, from which a rotationally symmetrical air jet on the expanding plastic blower to be led. LeerseiteBlank page
DE19702062510 1970-12-18 1970-12-18 Tempering and setting appts - for low pressure polyethylene blown film tubing Pending DE2062510A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19702062510 DE2062510A1 (en) 1970-12-18 1970-12-18 Tempering and setting appts - for low pressure polyethylene blown film tubing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702062510 DE2062510A1 (en) 1970-12-18 1970-12-18 Tempering and setting appts - for low pressure polyethylene blown film tubing

Publications (1)

Publication Number Publication Date
DE2062510A1 true DE2062510A1 (en) 1972-07-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2639551A1 (en) * 1976-09-02 1978-03-16 Reifenhaeuser Kg Blow-head with annular die and air ducts - for mfr. of blow-extruded tubular film, has air guide cylinder connected, by constricted connector, to inner wall of inner air duct

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2639551A1 (en) * 1976-09-02 1978-03-16 Reifenhaeuser Kg Blow-head with annular die and air ducts - for mfr. of blow-extruded tubular film, has air guide cylinder connected, by constricted connector, to inner wall of inner air duct

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