ITBZ960043A1 - DEVICE FOR HEATING THE SECTORS OF A LEAF TUBULAR EXTRUDED FROM A BLOWING HEAD. - Google Patents

DEVICE FOR HEATING THE SECTORS OF A LEAF TUBULAR EXTRUDED FROM A BLOWING HEAD. Download PDF

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Publication number
ITBZ960043A1
ITBZ960043A1 IT96BZ000043A ITBZ960043A ITBZ960043A1 IT BZ960043 A1 ITBZ960043 A1 IT BZ960043A1 IT 96BZ000043 A IT96BZ000043 A IT 96BZ000043A IT BZ960043 A ITBZ960043 A IT BZ960043A IT BZ960043 A1 ITBZ960043 A1 IT BZ960043A1
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IT
Italy
Prior art keywords
sectors
leaf
heating
heating elements
elements
Prior art date
Application number
IT96BZ000043A
Other languages
Italian (it)
Inventor
Werner Feistkorn
Klemens Sensen
Ansgar Avermeyer
Original Assignee
Windmoeller & Hoelscher
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Publication date
Application filed by Windmoeller & Hoelscher filed Critical Windmoeller & Hoelscher
Publication of ITBZ960043A1 publication Critical patent/ITBZ960043A1/en
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Publication of IT1288267B1 publication Critical patent/IT1288267B1/it

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/08—Conditioning or physical treatment of the material to be shaped by using wave energy or particle radiation
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/88—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
    • B29C48/91—Heating, e.g. for cross linking
    • B29C48/9105—Heating, e.g. for cross linking of hollow 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/92923—Calibration, after-treatment or cooling 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
    • B29C48/03—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

D E S C R I Z I O N E DESCRIPTION

annessa a domanda di brevetto per INVENZIONE INDUSTRIALE dal titolo: Dispositivo per il riscaldamento dei settori di un tubolare in foglia estruso da una testa di soffiatura attached to a patent application for INDUSTRIAL INVENTION entitled: Device for heating the sectors of a tubular sheet extruded from a blowing head

D E S C R I Z I O N E DESCRIPTION

L’invenzione si riferisce a un dispositivo per il riscaldamento dei settori di un tubolare in foglia in materiale sintetico termoplastico estruso e successivamente gonfiato da una testa di soffiatura di un impianto di estrusione in foglia. The invention refers to a device for heating the sectors of a tubular sheet in extruded thermoplastic synthetic material and subsequently inflated by a blowing head of a sheet extrusion plant.

Dai brevetti tedeschi 29 47 293, 29 50 003 e 3002 903 sono noti procedimenti per la regolazione dello spessore foglia di tubolari in foglia in materiale sintetico termoplastico realizzati in impianti di estrusione di foglie soffiate. Questi procedimenti di regolazione presuppongono che l’anello dell’ugello interno e/o esterno delimitante la fessura di uscita dalla testa di soffiatura sia suddiviso in settori di termoregolazione che sono provvisti di elementi termoregolatori e dei relativi dispositivi termoregolatori, laddove mediante un corrispondente intervento degli elementi di regolazione e’ possibile ottenere rapidamente una variazione del profilo di temperature sulla periferia del tubolare estruso in foglia, la quale e’ adattata ai punti spessi e sottili estrusi in modo che dopo il gonfiaggio del tubolare estruso a formare una bolla tubolare il diametro della foglia tubolare estrusa risulta sostanzialmente costante lungo la sua circonferenza. From German patents 29 47 293, 29 50 003 and 3002 903 processes are known for adjusting the leaf thickness of tubular sheets made of thermoplastic synthetic material made in blown leaf extrusion plants. These adjustment procedures presuppose that the ring of the internal and / or external nozzle delimiting the outlet slot from the blowing head is divided into thermoregulation sectors which are provided with thermoregulatory elements and the relative thermoregulatory devices, whereas by means of a corresponding intervention of the adjustment elements it is possible to rapidly obtain a variation of the temperature profile on the periphery of the extruded tubular sheet, which is adapted to the thick and thin extruded points so that after the inflation of the extruded tubular to form a tubular bubble the diameter of the extruded tubular sheet is substantially constant along its circumference.

Per eseguire il procedimento di regolazione noto si prevede che i settori termoregolatori dell’anello dell’ugello siano provvisti di cartucce riscaldanti o di tubazioni percorse da un mezzo termovettore. To carry out the known regulation procedure, the thermoregulatory sectors of the nozzle ring are provided with heating cartridges or pipes traversed by a heat transfer medium.

Il compito dell’invenzione consiste nel proporre per un dispositivo del suddetto tipo elementi riscaldanti, con i quali sia possibile riscaldare nel modo richiesto in caso di necessita’ in modo rapido i settori della foglia in modo corrispondente ai comandi forniti nei procedimenti di regolazione. The task of the invention is to propose heating elements for a device of the aforementioned type, with which it is possible to quickly heat the sectors of the leaf in the required manner in case of need in a manner corresponding to the commands provided in the adjustment procedures.

Questo compito viene risolto secondo una prima proposta in un dispositivo del suddetto tipo in cui l’anello a ugello interno e/o esterno delimitante la fessura di uscita della testa di soffiatura foglia e’ suddiviso in settori termoregolatori, i quali sono provvisti di elementi termoregolatori e di corrispondenti dispositivi termoregolatori, per il fatto che gli elementi termoregolatori sono composti da elementi di riscaldamento a ultrasuoni e/o a microonde. This task is solved according to a first proposal in a device of the above type in which the inner and / or outer nozzle ring delimiting the outlet slot of the leaf blowing head is divided into thermoregulatory sectors, which are provided with thermoregulatory elements and corresponding thermoregulatory devices, due to the fact that the thermoregulatory elements are composed of ultrasonic and / or microwave heating elements.

Gli elementi di riscaldamento a ultrasuoni e/o a microonde sono realizzabili in modo noto agli esperti del ramo in modo da potere venire alloggiati nei settori termoregolatori dell’anello a ugello, p.es. in fori paralleli all’asse del tubolare in foglia estruso. Secondo un ulteriore proposta il compito posto viene risolto in un dispositivo del tipo sopra indicato grazie al fatto che per il riscaldamento separato dei settori della foglia al di sopra della fessura di uscita della testa di soffiatura foglia sono disposti elementi riscaldanti diretti rispettivamente verso i singoli settori della foglia, i quali trasmettono calore ai settari della foglia senza entrare in contatto con essa. The ultrasonic and / or microwave heating elements can be manufactured in a manner known to those skilled in the art so as to be housed in the thermoregulatory sectors of the nozzle ring, for example in holes parallel to the axis of the extruded sheet tubular. According to a further proposal, the set task is solved in a device of the type indicated above thanks to the fact that for the separate heating of the leaf sectors above the outlet slot of the leaf blowing head, heating elements directed respectively towards the individual sectors are arranged. of the leaf, which transmit heat to the leaf sectaries without coming into contact with it.

La trasmissione senza contatto a seconda delle esigenze di calore corrispondente al relativo procedimento di regolazione verso i singoli settori della foglia e’ particolarmente vantaggiosa dato che la trasmissione di calore può avvenire in modo rapido. Nella trasmissione di calore senza contatto si elimina l’inerzia nella trasmissione di calore attraverso l’anello ugello, dovuta al fatto che il calore deve venire condotto attraverso il materiale dell’anello a ugello e si ottiene inoltre anche una certa compensazione delle diverse quantità’ di calore che vengono convogliate verso i singoli settori. The contactless transmission according to the heat requirements corresponding to the relative adjustment procedure towards the individual sectors of the leaf is particularly advantageous since the transmission of heat can take place quickly. In the contactless heat transfer, the inertia in the heat transfer through the nozzle ring is eliminated, due to the fact that the heat has to be conducted through the material of the nozzle ring and a certain compensation of the different quantities is also achieved. of heat that are conveyed to the individual sectors.

Gli elementi riscaldanti che convogliano il calore senza contatta possono essere composti da elementi a ultrasuoni. The heating elements that convey heat without contact can be composed of ultrasonic elements.

Gli elementi a ultrasuoni sono composti vantaggiosamente da un numero di attuatori corrispondente al numero di settori della foglia, i quali attuatori vengono sottoposti a impulsi nell’ordine dei millisecondi. Per mezzo di questi impulsi e’ possibile regolare e controllare precisamente la quantità’ di calore di volta in volta da trasmettere. The ultrasonic elements are advantageously composed of a number of actuators corresponding to the number of sectors of the leaf, which actuators are subjected to impulses in the order of milliseconds. By means of these pulses it is possible to precisely adjust and control the amount of heat to be transmitted from time to time.

Gli elementi riscaldanti senza contatto possono essere composti vantaggiosamente anche da elementi riscaldanti a microonde. Questi elementi riscaldanti possono essere composti da una sorgente di energia disposta ad anello attorno al tubolare in foglia estruso, laddove i singoli settori della foglia sono provvisti di diaframmi di regolazione, la cui sezione di apertura viene regolata in funzione della quantità’ di calore di volta in volta richiesta. The contactless heating elements can advantageously also be composed of microwave heating elements. These heating elements can be composed of an energy source arranged in a ring around the extruded sheet tubular, where the individual sectors of the sheet are provided with regulation diaphragms, the opening section of which is regulated according to the quantity of heat each time. request in time.

Gli elementi riscaldanti senza contatto possono infine essere anche composti da laser, laddove i raggi laser o raggi parziali vengono diretti sui settori della foglia per mezzo di corrispondenti specchi. I laser dovrebbero in questo caso essere attivi nello spettro di assorbimento della foglia. Finally, the non-contact heating elements can also be composed of lasers, where the laser beams or partial beams are directed onto the sectors of the leaf by means of corresponding mirrors. The lasers should in this case be active in the absorption spectrum of the leaf.

Claims (6)

Rivendicazioni 1. Dispositivo per il riscaldamento dei settori di un tubolare in foglia in materiale sintetico termoplastico estruso e successivamente gonfiato da una testa di soffiatura di un impianto di estrusione in foglia, in cui l’anello a ugello interno e/o esterno delimitante la fessura di uscita della testa di soffiatura foglia e’ suddiviso in settori termoregolatori, i quali sono provvisti di elementi termoregolatori e di corrispondenti dispositivi termoregolatori, caratterizzato dal fatto che gli elementi termoregolatori sono composti da elementi di riscaldamento a ultrasuoni e/o a microonde. Claims 1. Device for heating the sectors of a tubular sheet in extruded thermoplastic synthetic material and subsequently inflated by a blowing head of a sheet extrusion plant, in which the internal and / or external nozzle ring delimiting the output of the leaf blowing head is divided into thermoregulatory sectors, which are provided with thermoregulatory elements and corresponding thermoregulatory devices, characterized in that the thermoregulatory elements are composed of ultrasonic and / or microwave heating elements. 2. Dispositivo per il riscaldamento dei settori di un tubolare in foglia in materiale sintetica termoplastica estruso e successivamente gonfiato da una testa di soffiatura di un impianto di estrusione in foglia, caratterizzato dal fatto che per il riscaldamento separato dei settori della foglia al di sopra della fessura di uscita della testa di soffiatura foglia sono disposti elementi riscaldanti diretti rispettivamente verso i singoli settori della foglia i quali trasmettono calore ai settori della foglia, senza entrare in contatto con essa. 2. Device for heating the sectors of a tubular sheet in extruded thermoplastic synthetic material and subsequently inflated by a blowing head of a sheet extrusion plant, characterized in that for the separate heating of the sheet sectors above the The outlet slot of the leaf blowing head hosts heating elements directed respectively towards the single sectors of the leaf which transmit heat to the sectors of the leaf, without coming into contact with it. 3. Dispositivo secondo la rivendicazione 2, caratterizzato dal fatto che gli elementi riscaldanti sono composti da elementi a ultrasuoni. 3. Device according to claim 2, characterized in that the heating elements are composed of ultrasonic elements. 4. Dispositivo secondo la rivendicazione 2 o 3, caratterizzato dal fatto che gli elementi riscaldanti sono composti vantaggiosamente da un numero di attuatori corrispondente al numero di settori della foglia, i quali attuatori vengono sottoposti a impulsi nell’ordine dei millisecondi. 4. Device according to claim 2 or 3, characterized by the fact that the heating elements are advantageously composed of a number of actuators corresponding to the number of sectors of the leaf, which actuators are subjected to pulses in the order of milliseconds. 5. Dispositivo secondo la rivendicazione 2, caratterizzato dal fatto che gli elementi riscaldanti sona composti da elementi riscaldanti a microonde. 5. Device according to claim 2, characterized in that the heating elements are composed of microwave heating elements. 6. Dispositiva secondo la rivendicazione 2, caratterizzato dal fatto che gli elementi riscaldanti sono composti da laser di potenza. 6. Device according to claim 2, characterized in that the heating elements are composed of power lasers.
IT96BZ000043A 1995-11-06 1996-10-03 Dispositivo per il riscaldamento dei settori di un tubolare in foglia estruso da una testa di soffiatura. IT1288267B1 (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19541296A DE19541296C2 (en) 1995-11-06 1995-11-06 Device for heating the film sectors of a film tube extruded from a film blowing head

Publications (2)

Publication Number Publication Date
ITBZ960043A1 true ITBZ960043A1 (en) 1998-04-03
IT1288267B1 IT1288267B1 (it) 1998-09-11

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Application Number Title Priority Date Filing Date
IT96BZ000043A IT1288267B1 (it) 1995-11-06 1996-10-03 Dispositivo per il riscaldamento dei settori di un tubolare in foglia estruso da una testa di soffiatura.

Country Status (5)

Country Link
AT (1) AT407854B (en)
DE (1) DE19541296C2 (en)
FR (1) FR2740722B1 (en)
GB (1) GB2307881B (en)
IT (1) IT1288267B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19725810B4 (en) * 1997-06-18 2005-07-07 Helmut Knorr Nozzle for dispensing liquefied plastic under pressure
DE102010007658A1 (en) * 2010-02-10 2012-05-10 Case Tech Gmbh Method for drying tubular casings by microwaves

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US4112034A (en) * 1977-05-05 1978-09-05 General Electric Company Biaxial film process and rotary apparatus therefor
DD134052A1 (en) * 1977-12-08 1979-02-07 Jens Haupt ARRANGEMENT FOR THE VISCOSITIZATION LIGHTING OF PLASMA FILMS BY ULTRASOUND
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Also Published As

Publication number Publication date
FR2740722A1 (en) 1997-05-09
DE19541296A1 (en) 1997-05-07
IT1288267B1 (it) 1998-09-11
DE19541296C2 (en) 1999-07-01
AT407854B (en) 2001-07-25
ATA156396A (en) 2000-11-15
FR2740722B1 (en) 2000-05-19
GB2307881A (en) 1997-06-11
GB9621672D0 (en) 1996-12-11
GB2307881B (en) 1999-04-28

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