EP1109655A1 - Verfahren zum beschleunigen des konfektiven wärmetransfers in einem thermoschmelzbaren polymer - Google Patents

Verfahren zum beschleunigen des konfektiven wärmetransfers in einem thermoschmelzbaren polymer

Info

Publication number
EP1109655A1
EP1109655A1 EP99939307A EP99939307A EP1109655A1 EP 1109655 A1 EP1109655 A1 EP 1109655A1 EP 99939307 A EP99939307 A EP 99939307A EP 99939307 A EP99939307 A EP 99939307A EP 1109655 A1 EP1109655 A1 EP 1109655A1
Authority
EP
European Patent Office
Prior art keywords
polymer
ultrasonic vibrations
thermal radiation
source
hot
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Withdrawn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
EP99939307A
Other languages
English (en)
French (fr)
Inventor
Gianni Baffelli
Roberto Mattone
Carlo Riva
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.)
Ixtlan AG
Original Assignee
Ixtlan AG
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 Ixtlan AG filed Critical Ixtlan AG
Publication of EP1109655A1 publication Critical patent/EP1109655A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00Conditioning or physical treatment of the material to be shaped
    • B29B13/02Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023Half-products, e.g. films, plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/0261Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using ultrasonic or sonic vibrations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2067/00Use of polyesters or derivatives thereof, as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2067/00Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003PET, i.e. poylethylene terephthalate

Definitions

  • the present invention relates to a method for increasing the rate of heat transfer by thermal convection in a hot-melt polymer.
  • the heating of polymers constitutes a preliminary preparatory phase for the treatment of polymers by thermoforming or by blowing. It is usually done by exposing the polymers to an external source of thermal radiation. The temperature rise of the polymer mass takes place gradually by convection according to a downward inclined slope. When the polymer is exposed to the source of thermal radiation, the temperature in the area near the source is higher than that in the remote area. Gradually, the temperature difference between the near area and the far area becomes less. The heat is transmitted by convection for a more or less long time which depends in particular on the temperature of the source and the thickness of the material.
  • the duration of temperature rise of the polymer over its entire thickness conditions the process of shaping the material. A reduction in this duration improves the profitability of production.
  • the present invention therefore proposes to reduce this heating time by convection of a mass of hot-melt polymer.
  • This object is achieved by the process as defined in the preamble and characterized in exposing said polymer simultaneously to at least one source of thermal radiation and to ultrasonic vibrations, and transmitting said ultrasonic vibrations to said hot-melt polymer by applying directly to a surface of said polymer at least one energized sonotrode by an ultrasonic generator.
  • the application of ultrasonic vibrations and the simultaneous exposure to a source of thermal radiation results in a reorganization of the polymer molecules by promoting their orientation in a determined direction.
  • a surface of said polymer is exposed to a first source of thermal radiation and the opposite surface of said polymer to a second source of thermal radiation.
  • said ultrasonic vibrations are transmitted to said hot-melt polymer by putting at least one sonotrode in contact with an intermediate liquid which is in contact with a surface of said polymer.
  • said sources of thermal radiation have a temperature between 100 ° and 500 ° C and the frequency of ultrasonic vibrations is between 15 and 60 kHz.
  • the time of exposure to the radiation source thermal is between 1 and 10 seconds and preferably approximately equal to 3 seconds.
  • the ultrasonic vibrations are applied intermittently.
  • This variant also makes it possible to modulate the rate of heat transmission in the polymer.
  • the hot-melt polymer is exposed simultaneously to at least one source of thermal radiation and to ultrasonic vibrations.
  • a sonotrode powered by a ultrasonic generator.
  • One of its variants consists in exposing a surface of the polymer to a first source of thermal radiation, the surface opposite to a second source of thermal radiation and to simultaneously apply ultrasonic vibrations.
  • the radiation sources have a temperature between 100 ° and 500 ° C and the frequency of the ultrasonic vibrations transmitted is between 15 and 60 kHz.
  • thermoforming For products made of a hot-melt polymer such as polyethylene terephthalate (PET) having a thickness of a few millimeters, the time of exposure to a source of thermal radiation, necessary to make them sufficiently suitable for treatment of thermoforming, is between 1 and 10 seconds and preferably around 3 seconds.
  • PET polyethylene terephthalate
  • this polyethylene terephthalate does not undergo any crystallization at a temperature equal to or higher than the glass transition temperature which is generally higher than 70 ° C.
  • the structure becomes anisotropic and that the molecular chains of the hot-melt polymers are oriented in a preferential direction parallel to the axis of propagation of the ultrasonic vibrations.
  • the direction of the axis of propagation of the ultrasonic vibrations is chosen according to the geometry of the objects to be thermoformed.
  • the ultrasound is preferably applied in a direction which corresponds to the longest length of these objects.
  • the molecular chains are aligned in this direction and promotes the propagation of ultrasonic vibrations.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Thermal Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP99939307A 1998-09-01 1999-09-01 Verfahren zum beschleunigen des konfektiven wärmetransfers in einem thermoschmelzbaren polymer Withdrawn EP1109655A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9811212A FR2782665B1 (fr) 1998-09-01 1998-09-01 Procede pour augmenter la vitesse de convection thermique dans un polymere thermofusible
FR9811212 1998-09-01
PCT/CH1999/000405 WO2000012279A1 (fr) 1998-09-01 1999-09-01 Procede pour augmenter la vitesse de convection thermique dans un polymere thermofusible

Publications (1)

Publication Number Publication Date
EP1109655A1 true EP1109655A1 (de) 2001-06-27

Family

ID=9530234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99939307A Withdrawn EP1109655A1 (de) 1998-09-01 1999-09-01 Verfahren zum beschleunigen des konfektiven wärmetransfers in einem thermoschmelzbaren polymer

Country Status (5)

Country Link
EP (1) EP1109655A1 (de)
JP (1) JP2002523262A (de)
CA (1) CA2341600A1 (de)
FR (1) FR2782665B1 (de)
WO (1) WO2000012279A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030201581A1 (en) * 2002-02-28 2003-10-30 Jan Weber Ultrasonic assisted processes
GB0811548D0 (en) 2008-06-24 2008-07-30 Airbus Uk Ltd Method and apparatus for fabricating a fibre reinforced thermoplastic composite structure

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2855298A1 (de) * 1977-12-27 1979-07-05 Bassan & Cie Verfahren und vorrichtung zur herstellung von rohrfoermigen duebeln aus thermoplastischem material
JPS5515812A (en) * 1978-07-19 1980-02-04 Inoue Mtp Co Ltd Method of working the end of synthetic resin mole having stacked metal foil.
GB9414396D0 (en) * 1994-07-16 1994-09-07 Fairbank David Bollard refurbishment
JP3789145B2 (ja) * 1995-02-07 2006-06-21 富士写真フイルム株式会社 帯状物の平面性回復方法及びその装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0012279A1 *

Also Published As

Publication number Publication date
CA2341600A1 (fr) 2000-03-09
WO2000012279A1 (fr) 2000-03-09
FR2782665A1 (fr) 2000-03-03
FR2782665B1 (fr) 2000-11-10
JP2002523262A (ja) 2002-07-30

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