DE19600811A1 - Apparatus for biaxial orientation of thermoplastic film tubing - Google Patents

Apparatus for biaxial orientation of thermoplastic film tubing

Info

Publication number
DE19600811A1
DE19600811A1 DE19600811A DE19600811A DE19600811A1 DE 19600811 A1 DE19600811 A1 DE 19600811A1 DE 19600811 A DE19600811 A DE 19600811A DE 19600811 A DE19600811 A DE 19600811A DE 19600811 A1 DE19600811 A1 DE 19600811A1
Authority
DE
Germany
Prior art keywords
film
cooling
mandrel
contact
heating
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.)
Withdrawn
Application number
DE19600811A
Other languages
German (de)
Inventor
Zoltan-Andreas Doboczky
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.)
DOBOCZKY, ZOLTAN ANDREAS, 80686 MUENCHEN, DE
Original Assignee
DOBOCZKY ZOLTAN ANDREAS
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 DOBOCZKY ZOLTAN ANDREAS filed Critical DOBOCZKY ZOLTAN ANDREAS
Priority to DE19600811A priority Critical patent/DE19600811A1/en
Publication of DE19600811A1 publication Critical patent/DE19600811A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B29C48/03—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
    • B29C48/908—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
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip

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

The apparatus, to give a biaxial orientation to a tubular thermoplastics film, draws the film and does not blow it, to give a small blower diameter. The cooling stage is through a cooling spike at the inner surface of the film, closely below the film blower head in an adjustable mounting. The contact heating spike is close below the cooling spike, also in an adjustable mounting.The spikes are of a material with good thermal conductivity, such as copper or aluminium, with a plastics non-stick coating

Description

Die in der PA 195 45 526.6 angemeldete Vorrichtung kann auch so ausgeführt wer­ den, daß die Bildung einer zweiten Blase nicht erforderlich ist.The device registered in PA 195 45 526.6 can also be designed in this way that the formation of a second bubble is not necessary.

Der in den Patentansprüchen 1 bis 5 angegebenen Erfindung liegt das Problem zu­ grunde, daß gegenüber der oben genannten Vorrichtung, sowohl die Bauhöhe als auch der Energieverbrauch - keine Abstrahlung der Heizung - weiter reduziert und das Verfahren vereinfacht wird.The invention specified in claims 1 to 5 has the problem reasons that compared to the above device, both the height as also the energy consumption - no radiation from the heating - further reduced and the procedure is simplified.

Diese Aufgabe wird durch die, im Patentanspruch 1 bis 5, aufgeführten Merkmale gelöst.This object is achieved by the features listed in claims 1 to 5 solved.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß durch die Verwendung eines Kühldornes, welcher vorzugsweise einen kleineren Durchmesser als der Düsenring hat und direkt unterhalb der Foliendüse ist, die Bildung der ersten Blase vermieden wird. Der knapp unter dem Kühldorn befindliche Heizdorn ermög­ licht die Regelung des Schlauchdurchmessers auf die übliche Weise mit Druckluft­ zuführung durch den Folienblaskopf. Das erste Abquetschwalzenpaar entfällt und die gesamte Bauhöhe kann weiter vermindert werden. Außerdem wird durch die Kontaktheizung im Schlauchinneren der Energieverbrauch nochmals reduziert. Die Folie läuft nach Abkühlung der Oberfläche über ein Abquetschwalzenpaar, wie üblich, weiter. Die Kosten der Maschine sind ebenfalls geringer.The advantages achieved by the invention consist in particular in that Use of a cooling mandrel, which is preferably a smaller diameter than the nozzle ring and is just below the film nozzle, the formation of the first Bubble is avoided. The heating mandrel located just below the cooling mandrel enables light the regulation of the hose diameter in the usual way with compressed air feeding through the film die head. The first pair of squeeze rollers is omitted and the overall height can be further reduced. In addition, the Contact heating inside the hose further reduces energy consumption. After the surface has cooled, the film runs over a pair of squeeze rollers, such as usual, continue. The cost of the machine is also lower.

Ein Ausführungsbeispiel ist aus der Fig. 1 ersichtlich und wird im folgenden näher beschrieben.An embodiment is shown in FIG. 1 and will be described in more detail below.

Der aus der Foliendüse 1 austretende Schlauch 2 wird auf den Kühldorn 3 aufge­ zogen und durch die Kühlflüssigkeit 4 abgeschreckt. Der Schlauch gleitet über den entsprechend ausgebildeten und oberflächenbeschichteten Heizdorn 5 und erhält die zum Recken notwendige Temperatur. Um die Schlauchfolie an der Dornoberflä­ che festzuhalten, wird das Heizdornende mit einer Vakuumzone 6 versehen. Das Walzenpaar 8 wird geschlossen, so daß keine Luft mehr entweichen kann, und die Folie 2 wird zum Schlauch aufgeblasen, bis es das vorgesehene Kaliber erreicht hat und am Kontaktkühlring 7 satt anliegt.The emerging from the film nozzle 1 hose 2 is pulled up to the cooling mandrel 3 and quenched by the cooling liquid 4 . The hose slides over the appropriately designed and surface-coated heating mandrel 5 and receives the temperature necessary for stretching. In order to hold the tubular film on the surface of the mandrel, the end of the heating mandrel is provided with a vacuum zone 6 . The pair of rollers 8 is closed so that no more air can escape, and the film 2 is inflated to the hose until it has reached the intended caliber and fits snugly on the contact cooling ring 7 .

Der Schlauch 2 muß im satten Kontakt mit dem, auf die Recktemperatur aufgeheiz­ ten, Kontaktheizdorn 5 bleiben, um eine sichere Wärmeübertragung zu ermöglichen, was durch Vakuum am Dornende 6, oder durch Anwendung eines beheizten Außenringes (nicht dargestellt) erreicht wird. Die Folie wird bei laufendem Ab­ quetschwalzenpaar 8 eingezogen und die gewünschte Geschwindigkeit eingestellt. Die Blase 2, welche noch den ursprünglichen Durchmesser hat, wird mittels Zufüh­ rung der Druckluft 9 durch die Foliendüse 1 auf den vorgesehenen Durchmesser aufgeweitet. Um die Dimension weiter zu erhalten, muß die Blase im Kühlring 7 ebenfalls satt aufliegen. Erfahrungsgemäß erfolgt die simultan biaxiale - d. h. gleich­ zeitige Längs- und Querreckung auf einer Streckenlänge von weniger als 25 cm. Um den gleichmäßigen Abzug der Folie 2 über den Kontaktkühldorn 3 zu ermögli­ chen wird diese mit einem empirisch ermittelten günstigen Einlaufwinkel versehen. Um den verschiedenen Reibwerten der zu reckenden Folien 2 Rechnung zu tragen, wird für die hohen Reibwerte die Außenwand des Kühldornes 3 und des Heizdornes 5 mit einer Beschichtung - aus Kunststoff oder Metall - versehen, um das Anhaften zu vermeiden. The hose 2 must remain in full contact with the, heated to the stretching temperature, contact heater 5 in order to enable safe heat transfer, which is achieved by vacuum at the mandrel end 6 , or by using a heated outer ring (not shown). The film is drawn in while the squeeze roller pair 8 is running and the desired speed is set. The bladder 2 , which still has the original diameter, is expanded to the intended diameter by feeding the compressed air 9 through the film nozzle 1 . In order to maintain the dimension, the bubble in the cooling ring 7 must also lie snugly. Experience has shown that simultaneous biaxial stretching - that is, simultaneous longitudinal and transverse stretching - takes place over a length of less than 25 cm. In order to enable the uniform removal of the film 2 via the contact cooling mandrel 3 , this is provided with an empirically determined favorable inlet angle. In order to take into account the different coefficients of friction of the films 2 to be stretched, the outer wall of the cooling mandrel 3 and the heating mandrel 5 is provided with a coating — made of plastic or metal — for the high coefficients of friction, in order to avoid sticking.

Für hohe Geschwindigkeiten und große Aufblasverhältnisse kann am Heizdornende 6 Vakuum eingesetzt werden, um das satte Anliegen der Folie zu sichern. Der Kontaktkühlring 3 und Heizring 5 werden vorzugsweise aus einem sehr gut wärmeleitenden Material - Aluminium oder Kupfer - gefertigt. Die Auslegung der Kühlleistung wird je nach Rohstoff und Durchsatzmenge gewählt, was die Länge des Dornes bestimmt. Die Auslegung der Heizleistung erfolgt analog.For high speeds and high inflation conditions, 6 vacuum can be used at the end of the heating mandrel to ensure that the film fits snugly. The contact cooling ring 3 and heating ring 5 are preferably made of a very good heat-conducting material - aluminum or copper. The design of the cooling capacity is selected depending on the raw material and throughput, which determines the length of the mandrel. The heat output is designed analogously.

Das optimale Aufblasen der Folie 2 direkt hinter dem Kontaktheizdorn 5 wird durch die Ausführung des Dornendes mit einem günstigen Radius erreicht.The optimal inflation of the film 2 directly behind the contact heating mandrel 5 is achieved by designing the mandrel end with a favorable radius.

Die so gebildete, noch warme, Blase 2 wird durch den Kontaktkühlring 7 gezogen, wobei ebenfalls ein empirisch ermittelter günstiger Einzugswinkel gewählt ist. Sonst ist der Kalibrierring im weiteren Verlauf glatt. Die Oberfläche kann nach Notwendig­ keit ebenfalls beschichtet werden. Das Abquetschwalzenpaar 8 ist im Durchmesser mindestens 50 mm größer als der Blasenenddurchmesser, wodurch die Folie ohne Flachlegung mittels Leitblechen oder Rollen erfolgen kann. Die so erhaltene gereck­ te Folie kann des weiteren, je nach Material und gewünschtem Effekt, mit gezieltem Schrumpf oder Erhöhung der Spannung wärmebehandelt werden. Ebenfalls kann eine Oberflächenbehandlung durchgeführt werden.The still warm bladder 2 thus formed is drawn through the contact cooling ring 7 , an empirically determined favorable draft angle also being selected. Otherwise the calibration ring will be smooth in the further course. The surface can also be coated if necessary. The pinch roller pair 8 is at least 50 mm larger in diameter than the end diameter of the bubble, so that the film can be made without laying flat by means of guide plates or rollers. The stretched film obtained in this way can, depending on the material and the desired effect, be further heat-treated with targeted shrinking or increasing the tension. A surface treatment can also be carried out.

Claims (5)

1. Vorrichtung zum biaxialen Recken einer, aus ein- oder mehreren Schichten be­ stehenden, schlauchförmigen Folie aus thermoplastischem Kunststoff, für die möglichen Folienkombinationen, dadurch gekennzeichnet, daß die Schlauchfolie nicht aufgeblasen, sondern abgezogen wird, wobei ein kleinerer Blasendurchmesser entsteht und die gesamte Kühleinrichtung als Kontaktkühldorn an der Folieninnenfläche anliegt und sich dicht unter dem Folienblaskopf, vorzugsweise verstellbar, befindet. Der Kontaktheizdorn ist dicht unter dem Kontaktkühldorn und kann ebenfalls verstellbar ausgeführt werden.1. Device for the biaxial stretching of a tubular film made of thermoplastic material, consisting of one or more layers, for the possible film combinations, characterized in that the tubular film is not inflated, but is pulled off, with a smaller bubble diameter and the entire cooling device rests as a contact cooling mandrel on the inner surface of the film and is located just below the film die, preferably adjustable. The contact heating mandrel is located just below the contact cooling mandrel and can also be made adjustable. 2. Vorrichtung nach Patentanspruch 1 dadurch gekennzeichnet, daß der zum gleichmäßigen Lauf der Folie für jedes Material der optimale Einzugswinkel und der zum Aufblasverhältnis notwendige Auslaufradius in den Kühl- und Heizdorn eingearbeitet ist, für diese ein Werkstoff mit beson­ ders guter Wärmeleitfähigkeit, z. B. Kupfer oder Aluminium, verwendet wird, und die Kontaktfläche dessen, mit einer Spezialbeschichtung aus Kunststoff oder Metall, gegen Ankleben versehen ist.2. Device according to claim 1 characterized, that the optimal for the smooth running of the film for each material Infeed angle and the discharge radius necessary for the inflation ratio the cooling and heating mandrel is incorporated, for these a material with special ders good thermal conductivity, for. B. copper or aluminum is used and the contact surface of it, with a special coating made of plastic or metal, is provided against sticking. 3. Vorrichtung nach Patentanspruch 1 bis 2 dadurch gekennzeichnet, daß Nuten, Bohrungen oder Poren für Vakuumanschluß in der Heizeinrich­ tung vorgesehen sind.3. Device according to claim 1 to 2 characterized, that grooves, holes or pores for vacuum connection in the heater tion are provided. 4. Vorrichtung nach Patentanspruch 1 bis 3 dadurch gekennzeichnet, daß dicht unterhalb der Heizeinrichtung die Kontaktkühleinrichtung, vorzugs­ weise Wasserkühlung oder Temperierung, höhenverstellbar angeordnet, und mit allen für die Heizeinrichtung aufgeführten Merkmalen versehen ist.4. Device according to claim 1 to 3 characterized, that the contact cooling device, preferably below the heating device wise water cooling or tempering, height adjustable, and is provided with all the features listed for the heating device. 5. Vorrichtung nach Patentanspruch 1 bis 4 dadurch gekennzeichnet, daß das Abquetschwalzenpaar höhenverstellbar, bis dicht unter dem Kühlring, einen größeren Außendurchmesser als der maximale Blasendurch­ messer nach der Querreckung hat und nach Bedarf mit automatischer Durchmesserregelung ausgerüstet ist.5. Device according to claim 1 to 4 characterized, that the squeeze roller pair adjustable in height until just below the Cooling ring, a larger outer diameter than the maximum bubble diameter knife after transverse stretching and, if necessary, with automatic Diameter control is equipped.
DE19600811A 1995-12-06 1996-01-11 Apparatus for biaxial orientation of thermoplastic film tubing Withdrawn DE19600811A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19600811A DE19600811A1 (en) 1995-12-06 1996-01-11 Apparatus for biaxial orientation of thermoplastic film tubing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19545526A DE19545526A1 (en) 1995-12-06 1995-12-06 Biaxial stretching unit for single or multilayer thermoplastic sheet
DE19600811A DE19600811A1 (en) 1995-12-06 1996-01-11 Apparatus for biaxial orientation of thermoplastic film tubing

Publications (1)

Publication Number Publication Date
DE19600811A1 true DE19600811A1 (en) 1997-08-21

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Family Applications (2)

Application Number Title Priority Date Filing Date
DE19545526A Withdrawn DE19545526A1 (en) 1995-12-06 1995-12-06 Biaxial stretching unit for single or multilayer thermoplastic sheet
DE19600811A Withdrawn DE19600811A1 (en) 1995-12-06 1996-01-11 Apparatus for biaxial orientation of thermoplastic film tubing

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19545526A Withdrawn DE19545526A1 (en) 1995-12-06 1995-12-06 Biaxial stretching unit for single or multilayer thermoplastic sheet

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115489057A (en) * 2022-11-07 2022-12-20 南通环球塑料工程有限公司 A inflation stretching device for preparing thermal contraction film

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19946949A1 (en) * 1999-09-30 2001-04-19 Reifenhaeuser Masch In-line drawing of tubular film in second bubble, includes a stabilizing ring at exit from heater that follows first bubble

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115489057A (en) * 2022-11-07 2022-12-20 南通环球塑料工程有限公司 A inflation stretching device for preparing thermal contraction film

Also Published As

Publication number Publication date
DE19545526A1 (en) 1997-06-12

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