EP3056024A1 - Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm - Google Patents

Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm

Info

Publication number
EP3056024A1
EP3056024A1 EP14783619.1A EP14783619A EP3056024A1 EP 3056024 A1 EP3056024 A1 EP 3056024A1 EP 14783619 A EP14783619 A EP 14783619A EP 3056024 A1 EP3056024 A1 EP 3056024A1
Authority
EP
European Patent Office
Prior art keywords
film
extrusion
thermoplastic elastomer
membrane
producing
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.)
Ceased
Application number
EP14783619.1A
Other languages
German (de)
French (fr)
Inventor
Christian ZECHNER
Peter Pertl
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.)
Isovolta AG
Original Assignee
Isovolta 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 Isovolta AG filed Critical Isovolta AG
Priority to EP14783619.1A priority Critical patent/EP3056024A1/en
Publication of EP3056024A1 publication Critical patent/EP3056024A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • 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
    • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/16—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating
    • B32B37/18—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only
    • B32B37/182—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with all layers existing as coherent layers before laminating involving the assembly of discrete sheets or panels only one or more of the layers being plastic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/38—Loudspeaker cones; Acoustic diaphragms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2325/00—Polymers of vinyl-aromatic compounds, e.g. polystyrene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials

Definitions

  • the present invention relates to a process for producing a film for a
  • Speaker diaphragm or a microphone diaphragm Speaker diaphragm or a microphone diaphragm.
  • Electromagnetic converters are used for different types of speakers and
  • Microphones are used, especially for miniature speakers, as in
  • multifunctional multilayer films as membrane materials. These can be tailored by their structure targeted to the requirements of the acoustic system.
  • a fundamental feature of these multi-layer films is the thermoplastic matrix, which the processing!
  • a loudspeaker membrane which is constructed in three layers: on a fabric as a basis are one or two layers of a
  • thermoplastic resin From US 2012/0060997 Al a film is known, which has at least one film of a polypropylene homopolymer with a modifier. From US 4,761,451 an acoustic vibration membrane made of polypropylene and a thermoplastic styrene block copolymer is known. From EP 1 113 704 A2, in turn, a diaphragm for a loudspeaker is known, wherein the diaphragm has a foam of a base resin of an aromatic polycarbonate, to at least 50% by weight.
  • Membrane films with mechanically strong outer layers and a flexible core layer are in the range of 600 Hz to 1000 Hz, depending on the structure and design. These frequencies are located but in the use of miniature speakers, which can lead to unwanted acoustic effects.
  • silicones are also called
  • From EP 2 268 058 AI is a membrane for a micro-speaker and a
  • the membrane comprises an elastomer having a thickness of less than 0.3 mm and a Young's modulus of less than 100 MPa.
  • EP 2 268 058 AI it should be noted that a membrane made of an elastomer can be produced by injection molding and that this technique is a very stable
  • the present invention has as its first object to provide an alternative method for producing a film for a loudspeaker membrane or a microphone membrane.
  • the inventive method for producing a film for a loudspeaker membrane or a microphone membrane of a thermoplastic elastomer is characterized in that a thermoplastic elastomer is formed by extrusion into a film.
  • a preferred embodiment of the inventive method for producing an at least two-ply film is that the extrusion is carried out as co-extrusion with at least one thermoplastic elastomer.
  • the co-extrusion can be carried out with at least two mutually chemically different thermoplastic elastomers or with the thermoplastic elastomer and at least one thermoplastic material.
  • Preparation of a film which is at least two-ply is that at least one further film, optionally produced by extrusion from a thermoplastic material, is laminated to a film produced by extrusion from a thermoplastic elastomer.
  • thermoplastic elastomer SBS styrene-butadiene block copolymer
  • SEBS styrene-ethylene-butylene-styrene block copolymer
  • copolyester and / or polyamide very well, with SEBS and / or SBS are particularly preferred.
  • the extrusion or coextrusion is best carried out so that the film has a thickness between 10 ⁇ and 300 ⁇ .
  • the invention further relates to a film which is produced by the process according to the invention and is formed as a monofilm, being provided as the thermoplastic elastomer SBS and / or SEBS.
  • the present invention relates to the use of an after
  • the films of the invention have compared to a silicone film, one of the
  • Films according to the invention has comparatively low resonant frequency, a much better attenuation, whereby the fiction, contemporary films for microspeakers and microphones are far better.
  • Film materials are determined as follows, the measuring device being shown schematically in FIG. 3: A film sample strip 9, with the typical dimension 10x15 mm, is clamped on one side in the test box 11 with the aid of a tensioning device 10.
  • the sample is pneumatically generated by sinusoidal sound waves generated by a loudspeaker 12, the one
  • Figure 1 shows schematically the structure of a
  • Extruder in section with the screw 1, which is located in the cylinder 2.
  • the drive is indicated schematically at 3.
  • the reference numeral 4 stands for the hopper. 2 shows schematically the system for film extrusion with a slot die 5 for extension of the film 7, which is first drawn off via a cooling roller 6 and finally rolled up (roll 8).
  • a polymer melt extruder can be used to produce monofilms.
  • multilayer films can then be laminated.
  • extruders and multi-layer dies for the production of co-extruded
  • Multi-layer films are used.
  • the processing temperature in the extruder is in the range of 160 ° C to 250 ° C.
  • an air knife or pressure roller can be used to smooth the film.
  • the stretching of the film is preferably carried out between the nozzle outlet and the cooling roller at take-off speeds of 20 m / min to 500 m / min.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

The invention relates to a method for producing a film (7) for a loudspeaker diaphragm or a microphone diaphragm on the basis of a thermoplastic elastomer and is characterized in that a thermoplastic elastomer is shaped to a film by extrusion.

Description

Verfahren zur Herstellung einer Folie für eine Lautsprecher-Membran oder eine Mikrophon- Method for producing a film for a loudspeaker membrane or a microphone
Membran membrane
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Folie für eine The present invention relates to a process for producing a film for a
Lautsprecher-Membran oder eine Mikrophon-Membran. Speaker diaphragm or a microphone diaphragm.
Elektromagnetische Wandler werden für verschiedene Arten von Lautsprechern und Electromagnetic converters are used for different types of speakers and
Mikrophonen eingesetzt, insbesondere auch für Miniaturlautsprecher, wie sie in Microphones are used, especially for miniature speakers, as in
Mobiltelefonen, Notebooks, Tablets, Spielkonsolen, Kopfhörern, Freisprecheinrichtungen, modernen Fernsehern und auch im Automobilbereich Anwendung finden. Mobile phones, notebooks, tablets, game consoles, headphones, hands-free, modern TVs and also in the automotive sector.
Ein allgemeiner Markttrend zeigt, dass die Bauform derartiger Lautsprecher kein einheitliches Design zulässt und eine große Flexibilität der Hersteller fordert. Zudem werden häufig kleinste Bauformen mit maximaler Leistung erwartet. Dennoch werden höchste A general market trend shows that the design of such speakers does not allow a uniform design and requires great flexibility of the manufacturer. In addition, smallest models with maximum performance are often expected. Nevertheless, the highest will be
Anforderungen an die akustische Qualität gestellt. All diese Anforderungen stellen enorme technologische Ansprüche an die Membran, welche als Herzstück eines Lautsprechers bzw. Mikrophons fungiert. Requirements placed on the acoustic quality. All these requirements place enormous technological demands on the membrane, which acts as the heart of a loudspeaker or microphone.
Um diesen Anforderungen gerecht zu werden, setzen Hersteller von Miniaturlautsprechern multifunktionelle Mehrschichtfolien als Membranmaterialien ein. Diese können durch deren Aufbau gezielt auf die Anforderungen des akustischen Systems abgestimmt werden. Ein grundlegendes Merkmal dieser Mehrschichtfolien ist die thermoplastische Matrix, welche den Verarbeiten! dieser Membranmaterialien akustische Optimierungsmöglichkeiten und eine maximale Flexibilität in Designgebung erlaubt. To meet these requirements, manufacturers of miniature loudspeakers use multifunctional multilayer films as membrane materials. These can be tailored by their structure targeted to the requirements of the acoustic system. A fundamental feature of these multi-layer films is the thermoplastic matrix, which the processing! These membrane materials allow acoustic optimization possibilities and maximum flexibility in design.
Aus der US 2004/0112671 AI ist eine Lautsprechermembran bekannt, welche dreischichtig aufgebaut ist: auf einem Gewebe als Basis sind ein oder zwei Schichten aus einem From US 2004/0112671 AI a loudspeaker membrane is known, which is constructed in three layers: on a fabric as a basis are one or two layers of a
thermoplastischen Harz aufgetragen. Aus der US 2012/0060997 AI ist eine Folie bekannt, welche mindestens einen Film aus einem Polypropylen-Homopolymer mit einem Modifikator aufweist. Aus der US 4,761,451 ist eine akustische Vibrationsmembran aus Polypropylen und einem thermoplastischen Styrol-Block-Copolymer bekannt. Aus der EP 1 113 704 A2 wiederum ist ein Diaphragma für einen Lautsprecher bekannt, wobei das Diaphragma einen Schaum eines Basisharzes aus einem aromatischen Polycarbonat, und zwar zu mindestens 50 Gew.- , aufweist. applied thermoplastic resin. From US 2012/0060997 Al a film is known, which has at least one film of a polypropylene homopolymer with a modifier. From US 4,761,451 an acoustic vibration membrane made of polypropylene and a thermoplastic styrene block copolymer is known. From EP 1 113 704 A2, in turn, a diaphragm for a loudspeaker is known, wherein the diaphragm has a foam of a base resin of an aromatic polycarbonate, to at least 50% by weight.
Die Resonanzfrequenz von heute bekannten Mikrolautsprechern mit mehrschichtigen The resonant frequency of today known micro loudspeakers with multilayered
Membranfolien mit mechanisch festen Außenlagen und flexibler Kernschicht liegt je nach Aufbau und Design im Bereich von 600 Hz bis 1000 Hz. Diese Frequenzen befinden sich jedoch im Einsatzbereich von Miniaturlautsprechern, was zu unerwünschten akustischen Effekten führen kann. Membrane films with mechanically strong outer layers and a flexible core layer are in the range of 600 Hz to 1000 Hz, depending on the structure and design. These frequencies are located but in the use of miniature speakers, which can lead to unwanted acoustic effects.
Um niedrigere Resonanzfrequenzen zu erreichen, werden auch Silikone als To achieve lower resonance frequencies, silicones are also called
Membranmaterialien eingesetzt. Mit Silikon lassen sich Eigenfrequenzen der Membran deutlich unter denen von Mehrschichtfolien einstellen. Silikone werden für diese akustischen Anwendungen durch Spritz guss verarbeitet, wobei sie bereits ihr endgültiges Design bekommen. Durch dieses Verarbeitungskonzept kann ein wesentlicher Verarbeitungsschritt, das Thermoformen, eingespart werden, Membrane materials used. With silicone, natural frequencies of the membrane can be set significantly below those of multilayer films. Silicones are processed by injection molding for these acoustic applications, and they are already getting their final design. Through this processing concept, an essential processing step, the thermoforming can be saved,
Aus der EP 2 268 058 AI ist eine Membran für einen Mikro-Lautsprecher sowie ein From EP 2 268 058 AI is a membrane for a micro-speaker and a
Verfahren zu Herstellung der Membran bekannt. Die Membran umfasst ein Elastomer mit einer Dicke von weniger als 0,3 mm und einem Young' sehen Modul von unter 100 MPa. In der EP 2 268 058 AI wird darauf hingewiesen, daß eine Membran aus einem Elastomer mit Spritzguß-Technik hergestellt werden könne und daß diese Technik ein sehr stabiles Process for producing the membrane known. The membrane comprises an elastomer having a thickness of less than 0.3 mm and a Young's modulus of less than 100 MPa. In EP 2 268 058 AI it should be noted that a membrane made of an elastomer can be produced by injection molding and that this technique is a very stable
Herstellungsverfahren bei geringer Schwankung der Membrandicke ermögliche. Zusätzlich falle beim Spritzguß - im Gegensatz zur Tiefzieh-Technik - geringerer Abfall an. Manufacturing process with little variation of the membrane thickness possible. Additionally fall in the injection molding - in contrast to the thermoforming technique - lower waste.
Die vorliegende Erfindung setzt sich als erstes Ziel, ein alternatives Verfahren zur Herstellung einer Folie für eine Lautsprecher- Membran oder eine Mikrophon-Membran zur Verfügung zu stellen. The present invention has as its first object to provide an alternative method for producing a film for a loudspeaker membrane or a microphone membrane.
Das erfindungsgemäße Verfahren zur Herstellung einer Folie für eine Lautsprecher- Membran oder eine Mikrophon-Membran aus einem thermoplastischen Elastomer ist dadurch gekennzeichnet, daß ein thermoplastisches Elastomer durch Extrusion zu einer Folie geformt wird. The inventive method for producing a film for a loudspeaker membrane or a microphone membrane of a thermoplastic elastomer is characterized in that a thermoplastic elastomer is formed by extrusion into a film.
Es hat sich gezeigt, daß es mittels der Extrusions-Technik einfach möglich ist, Folien herzustellen, die zu einer Lautsprecher-Membran oder eine Mikrophon-Membran mit sehr guten akustischen Eigenschaften weiterverarbeitet werden können. It has been found that by means of the extrusion technique it is easily possible to produce films which can be further processed into a loudspeaker membrane or a microphone membrane having very good acoustic properties.
Eine bevorzugte Ausführungsform des erfindungs gemäßen Verfahrens zur Herstellung einer mindestens zweilagigen Folie besteht darin, daß die Extrusion als Co-Extrusion mit mindestens einem thermoplastischen Elastomer vorgenommen wird. A preferred embodiment of the inventive method for producing an at least two-ply film is that the extrusion is carried out as co-extrusion with at least one thermoplastic elastomer.
Die Co-Extrusion kann mit mindestens zwei voneinander chemisch unterschiedlichen thermoplastischen Elastomeren oder mit dem thermoplastischen Elastomer und mindestens einem thermoplastischen Material vorgenommen werden. Eine weitere bevorzugte Ausführungsform des erfindungsgemäßen Verfahrens zur The co-extrusion can be carried out with at least two mutually chemically different thermoplastic elastomers or with the thermoplastic elastomer and at least one thermoplastic material. A further preferred embodiment of the method according to the invention for
Herstellung einer mindestens zweilagigen Folie besteht darin, daß auf eine durch Extrusion aus einem thermoplastischen Elastomer hergestellte Folie mindestens eine weitere, gegebenenfalls durch Extrusion aus einem thermoplastischen Material hergestellte Folie laminiert wird. Preparation of a film which is at least two-ply is that at least one further film, optionally produced by extrusion from a thermoplastic material, is laminated to a film produced by extrusion from a thermoplastic elastomer.
Es hat sich gezeigt, daß sich zur Herstellung der Folie als thermoplastisches Elastomer SBS (=Styrol-Butadien-Blockcopolymer), SEBS (=Styrol-Ethylen-Butylen-Styrol- Blockcopolymer), Copolyester und/oder Polyamid sehr gut eignet, wobei SEBS und/oder SBS besonders bevorzugt sind. It has been found that very suitable for the production of the film as a thermoplastic elastomer SBS (= styrene-butadiene block copolymer), SEBS (= styrene-ethylene-butylene-styrene block copolymer), copolyester and / or polyamide very well, with SEBS and / or SBS are particularly preferred.
Die Extrusion bzw. Coextrusion wird am besten so durchgeführt, daß die Folie eine Dicke zwischen 10 μιη und 300 μιη aufweist. The extrusion or coextrusion is best carried out so that the film has a thickness between 10 μιη and 300 μιη.
Die Erfindung betrifft ferner eine Folie, die nach dem erfindungsgemäßen Verfahren hergestellt und als Monofolie ausgebildet ist, wobei als thermoplastisches Elastomer SBS und/oder SEBS vorgesehen ist. The invention further relates to a film which is produced by the process according to the invention and is formed as a monofilm, being provided as the thermoplastic elastomer SBS and / or SEBS.
Zusätzlich betrifft die vorliegende Erfindung die Verwendung einer nach dem In addition, the present invention relates to the use of an after
erfindungsgemäßen Verfahren hergestellten Folie zur Herstellung einer Lautsprecher- Membran, wobei diese Herstellung nach einem im Stand der Technik bekannten Verfahren vorgenommen werden kann. According to the invention produced film for producing a loudspeaker membrane, wherein this preparation can be made by a method known in the art.
Die erfindungs gemäße Folie ermöglicht niedrigere Resonanzfrequenzbereiche und dämpft besser als Monofolien aus Silikon und anderen im Stand der Technik bekannten Monofolien. In Vergleichsversuchen konnte nachgewiesen werden, dass z.B. die Resonanzfrequenz einer SEBS-Folie bei etwa 8,8 Hz liegt, wogegen die Resonanzfrequenzen einer vergleichbaren PE- HD-Folie (=Polyethylen mit hoher Dichte) und einer PET- Folie (PET = The fiction, contemporary film allows lower resonance frequency ranges and attenuates better than monofilms of silicone and other known in the art monofilms. In comparative experiments it could be demonstrated that e.g. the resonance frequency of a SEBS film is about 8.8 Hz, whereas the resonance frequencies of a comparable PE-HD film (= high-density polyethylene) and a PET film (PET =
Polyethylenterephthalat) bei 21,3 Hz bzw. bei 68,5 Hz liegen. Andererseits besitzen die erfindungsgemäßen Folien im Vergleich zu einer Silikon-Folie, die eine zu den Polyethylene terephthalate) at 21.3 Hz or at 68.5 Hz. On the other hand, the films of the invention have compared to a silicone film, one of the
erfindungsgemäßen Folien vergleichbar niedrige Resonanzfrequenz aufweist, eine wesentlich bessere Dämpfung, wodurch sich die erfindungs gemäßen Folien für Mikrolautsprecher und Mikrophone weit besser eignen. Films according to the invention has comparatively low resonant frequency, a much better attenuation, whereby the fiction, contemporary films for microspeakers and microphones are far better.
Die Resonanzfrequenz, das Dämpfungsverhalten und der E-Modul der polymeren The resonance frequency, the damping behavior and the modulus of elasticity of the polymer
Filmmaterialien wird wie folgt bestimmt, wobei die Meßvorrichtung in der Fig. 3 schematisch gezeigt ist: Ein Folien-Probestreifen 9, mit der typischen Abmessung 10x15 mm, wird mit Hilfe einer Spannvorrichtung 10 einseitig in die Testbox 11 eingespannt. Die Probe wird pneumatisch durch Sinus Schallwellen, die von einem Lautsprecher 12 erzeugt werden, der einen Film materials are determined as follows, the measuring device being shown schematically in FIG. 3: A film sample strip 9, with the typical dimension 10x15 mm, is clamped on one side in the test box 11 with the aid of a tensioning device 10. The sample is pneumatically generated by sinusoidal sound waves generated by a loudspeaker 12, the one
Frequency-Sweep durchführt, angeregt. Während der Messung werden parallel der Frequency sweep, excited. During the measurement will be parallel to the
Schalldruck innerhalb der Testbox mittels eines Mikrophones 13 und die Auslenkungen des Probekörpers x mittels eines Lasersensors 14 gemessen. Die Daten werden einer Analyzer- Hardware zugeführt und mithilfe vorgegebener Daten (Geometrie, Masse) werden Sound pressure within the test box by means of a microphone 13 and the deflections of the specimen x measured by a laser sensor 14. The data will be fed to an analyzer hardware and will be using given data (geometry, mass)
Resonanzfrequenz, Verlustfaktor (Dämpfung) und modaler E-Modul errechnet. Resonant frequency, loss factor (damping) and modal modulus of elasticity.
Das erfindungsgemäße Verfahren kann an herkömmlichen Extrudern mit Foliendüse ausgeführt werden. In der Zeichnung zeigt die Figur 1 schematisch den Aufbau eines The process according to the invention can be carried out on conventional extruders with a film die. In the drawing, Figure 1 shows schematically the structure of a
Extruders im Schnitt, mit der Schnecke 1, die sich im Zylinder 2 befindet. Der Antrieb ist schematisch mit 3 bezeichnet. Die Bezugsziffer 4 steht für den Einfülltrichter. Die Figur 2 zeigt schematisch die Anlage zur Folienextrusion mit einer Breitschlitzdüse 5 zur Extension der Folie 7, die zunächst über eine Kühlwalze 6 abgezogen und schließlich aufgerollt wird (Rolle 8). Extruder in section, with the screw 1, which is located in the cylinder 2. The drive is indicated schematically at 3. The reference numeral 4 stands for the hopper. 2 shows schematically the system for film extrusion with a slot die 5 for extension of the film 7, which is first drawn off via a cooling roller 6 and finally rolled up (roll 8).
Zur Herstellung von Monofolien kann somit ein Polymerschmelzeextruder eingesetzt werden. Zur Herstellung von mehrlagigen Folien kann anschließend laminiert werden. Es können auch mehrere Extruder und Mehrschichtdüsen zur Herstellung von co-extrudierten Thus, a polymer melt extruder can be used to produce monofilms. For the production of multilayer films can then be laminated. It can also be several extruders and multi-layer dies for the production of co-extruded
Mehrschichtfolien eingesetzt werden. Multi-layer films are used.
Die Verarbeitungstemperatur im Extruder liegt im Bereich von 160 °C bis 250 °C. The processing temperature in the extruder is in the range of 160 ° C to 250 ° C.
Beim Folienextrusionsprozeß kann eine Luftrakel bzw. Anpresswalze zum Glätten der Folie verwendet werden. In the film extrusion process, an air knife or pressure roller can be used to smooth the film.
Die Verstreckung der Folie erfolgt bevorzugt zwischen Düsenaustritt und Kühlwalze bei Abzugsgeschwindigkeiten von 20 m/min bis 500 m/min. The stretching of the film is preferably carried out between the nozzle outlet and the cooling roller at take-off speeds of 20 m / min to 500 m / min.

Claims

Patentansprüche: claims:
1. Verfahren zur Herstellung einer Folie aus einem thermoplastischen Elastomer für eine Lautsprecher-Membran oder eine Mikrophon-Membran, 1. A process for producing a thermoplastic elastomer film for a loudspeaker membrane or a microphone membrane,
dadurch gekennzeichnet, characterized,
daß ein thermoplastisches Elastomer durch Extrusion zu einer Folie geformt wird. that a thermoplastic elastomer is formed into a film by extrusion.
2. Verfahren nach Anspruch 1 zur Herstellung einer mindestens zweilagigen Folie, dadurch gekennzeichnet, daß die Extrusion als Co-Extrusion mit mindestens einem 2. The method according to claim 1 for producing a at least two-ply film, characterized in that the extrusion as co-extrusion with at least one
thermoplastischen Elastomer vorgenommen wird. thermoplastic elastomer is made.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Co-Extrusion mit mindestens zwei voneinander chemisch unterschiedlichen thermoplastischen Elastomeren oder mit dem thermoplastischen Elastomer und mindestens einem thermoplastischen Material vorgenommen wird. 3. The method according to claim 2, characterized in that the co-extrusion is carried out with at least two mutually chemically different thermoplastic elastomers or with the thermoplastic elastomer and at least one thermoplastic material.
4. Verfahren nach Anspruch 1 zur Herstellung einer mindestens zweilagigen Folie, dadurch gekennzeichnet, daß auf eine durch Extrusion aus einem thermoplastischen 4. The method according to claim 1 for the preparation of a at least two-ply film, characterized in that a by extrusion from a thermoplastic
Elastomer hergestellte Folie mindestens eine weitere, gegebenenfalls durch Extrusion aus einem thermoplastischen Material hergestellten Folie laminiert wird. Elastomer-made film at least one further, optionally prepared by extrusion from a thermoplastic material film is laminated.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß als thermoplastisches Elastomer eines aus der Gruppe bestehend aus SBS, SEBS, Copolyester und Polyamid gewählt ist. 5. The method according to any one of claims 1 to 4, characterized in that one of the group consisting of SBS, SEBS, copolyester and polyamide is selected as thermoplastic elastomer.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß als thermoplastisches Elastomer SEBS und/oder SBS gewählt ist. 6. The method according to claim 5, characterized in that is selected as the thermoplastic elastomer SEBS and / or SBS.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Extrusion bzw. Coextrusion so durchgeführt wird, daß die Folie eine Dicke zwischen 10 μιη und 300 μιη aufweist. 7. The method according to any one of claims 1 to 6, characterized in that the extrusion or coextrusion is carried out so that the film has a thickness between 10 μιη and 300 μιη.
8. Folie, hergestellt nach einem der Ansprüche 1 bis 7, ausgebildet als Monofolie und enthaltend als thermoplastisches Elastomer SBS oder SEBS. 8. A film, produced according to one of claims 1 to 7, formed as monofilm and containing as thermoplastic elastomer SBS or SEBS.
9. Verwendung einer nach einem der Ansprüche 1 bis 7 hergestellten Folie zur 9. Use of a film produced according to one of claims 1 to 7 for
Herstellung einer Lautsprecher-Membran oder einer Mikrophon-Membran. Production of a loudspeaker membrane or a microphone membrane.
EP14783619.1A 2013-10-11 2014-10-10 Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm Ceased EP3056024A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14783619.1A EP3056024A1 (en) 2013-10-11 2014-10-10 Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13188270 2013-10-11
PCT/EP2014/071761 WO2015052316A1 (en) 2013-10-11 2014-10-10 Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm
EP14783619.1A EP3056024A1 (en) 2013-10-11 2014-10-10 Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm

Publications (1)

Publication Number Publication Date
EP3056024A1 true EP3056024A1 (en) 2016-08-17

Family

ID=49356251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14783619.1A Ceased EP3056024A1 (en) 2013-10-11 2014-10-10 Method for producing a film for a loudspeaker diaphragm or a microphone diaphragm

Country Status (7)

Country Link
US (1) US20160234617A1 (en)
EP (1) EP3056024A1 (en)
JP (1) JP2016534685A (en)
KR (1) KR20160070749A (en)
CN (1) CN105637900A (en)
HK (1) HK1223760A1 (en)
WO (1) WO2015052316A1 (en)

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WO2024124524A1 (en) * 2022-12-16 2024-06-20 3M Innovative Properties Company Diaphragm for microspeaker and related processes

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KR20160070749A (en) 2016-06-20
US20160234617A1 (en) 2016-08-11
CN105637900A (en) 2016-06-01
WO2015052316A1 (en) 2015-04-16
HK1223760A1 (en) 2017-08-04
JP2016534685A (en) 2016-11-04

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