WO2014135620A1 - Multilayer-compound membrane for electroacoustic transducers - Google Patents

Multilayer-compound membrane for electroacoustic transducers Download PDF

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Publication number
WO2014135620A1
WO2014135620A1 PCT/EP2014/054317 EP2014054317W WO2014135620A1 WO 2014135620 A1 WO2014135620 A1 WO 2014135620A1 EP 2014054317 W EP2014054317 W EP 2014054317W WO 2014135620 A1 WO2014135620 A1 WO 2014135620A1
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WO
WIPO (PCT)
Prior art keywords
layer
glue
compound membrane
peek
central
Prior art date
Application number
PCT/EP2014/054317
Other languages
French (fr)
Inventor
Christian Bertl
Peter Pertl
Christian ZECHNER
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
Publication of WO2014135620A1 publication Critical patent/WO2014135620A1/en

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Classifications

    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • 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
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/288—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyketones
    • 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
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • 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

Definitions

  • the present invention relates to an acoustic compound membrane and to an acoustic device comprising such a compound membrane.
  • the invention relates in particular to a polymeric multilayer-compound membrane, used in an electroacoustic transducer.
  • Electroacoustic transducers are used for varying kinds of loudspeakers, like micro-speakers for mobile-phones, notebooks, in-ear- or automotive applications. This field rapidly develops towards smaller construction components, keeping the same acoustic performance.
  • Multi-layer membranes are built, using three-layered structures with relatively stiff polymer films as outer layers and soft glue layer ("damping layers") in-between. In many transducer applications, this sort of membranes also does not fully meet the requirements for high acoustic performance combined with long time endurance, especially at increased temperatures.
  • Polymeric film core-layers having soft glue layers on both sides and polymeric films as outer layer on both surfaces are building five-layered structures. These structures were introduced to further increase performance mainly on long term. State-of-the-art five-layered compounds usually do have PET (Polyethylene Terephthalate)-films as a core layer and various polymer films as outer surface layers. These structures do have limits in terms of anti-fatigue and high temperature performance due to the nature of PET-core layer.
  • the present invention is directed to an acoustic compound membrane comprising:
  • center layer (C) comprises material selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polybutadien Terephthalate (PBT),
  • PI Polyimide
  • PEN Polyethylene Naphthalate
  • PBT Polybutadien Terephthalate
  • PPS Polyphenylensulfide
  • PSU Polysulfone
  • PC Polycarbonate
  • PAEK Polyaryletherketone
  • the material of the upper layer (A) or the lower layer (B) is selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polyaryletherketone (PAEK, e.g. PEEK), Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and
  • PI Polyimide
  • PEN Polyethylene Naphthalate
  • PAEK Polyaryletherketone
  • PPS Polyphenylensulfide
  • PSU Polysulfone
  • PC Polycarbonate
  • the glue layer is made of acrylics, silicones, thermoplastic elastomers (TPE) or thermoplastic urethanes (TPU).
  • the two outer layers do not necessarily have to be the same kind and their thickness may vary.
  • a preferred embodiment of the present invention is an acoustic compound membrane, wherein the material of the upper layer (A) and the lower layer (B) is Polyarylate (PAR) and wherein the material of the center layer (C) is Polyaryletherketone (PAEK, e.g. PEEK).
  • PAR Polyarylate
  • PAEK Polyaryletherketone
  • Figure 1 shows a five-layer compound membrane, comprising two outer layers (A, B) and an inner layer (C).
  • the layers A and C, as well as C and B, are connected by glue layers (D ⁇ D 2 ).
  • the central, inner layer C is on both sides attached to the glue layers (D ⁇ D 2 ), where the second glue layer D 2 is attached to a second outer layer B.
  • Layer A and B may consist either of the same or different materials and thicknesses.
  • the glue layers (D ⁇ D 2 ) are made of acrylics, silicones, thermoplastic elastomers (TPE) or thermoplastic urethanes (TPU).
  • the Production has two main steps.
  • Production Step One shown in Figure 2 the glue layers (Pi; D 2 ) are applied to both sides of the central film layer C.
  • Production Step Two shown in Figure 3 all layers are combined to form the compound membrane.
  • the surface of both sides of the central film layer C is treated with a suitable method to increase the bonding properties.
  • the method depends on chemical and mechanical properties of central film layer and adhesive glue layer. These treatments include corona, plasma and flame treatment.
  • the central film layer C is coated simultaneously on both sides in one step.
  • the diluent is dried in a hot air flotation dryer tunnel.
  • the 3 layer structure (D ⁇ C-D ⁇ is covered with a protective release liner form unwind station O and wound up on rewind station P, see Figure 2.
  • Unwind station K - Typical Tensions: 10-1000 [N]
  • Floatation dryer N1-N6 - Typical Temperatures (depending on the diluent):
  • Nl 50-120°C N2: 60-130°C N3: 60-140°C N4: 60-140°C N5: 60-150°C N6: 50-150°C
  • Unwind station O - Typical Tensions: 10-1000 [N]
  • Rewind station P - Typical Tensions: 30-1000 [N]
  • the preferred method is curtain coating.
  • the preferred method is multi roll coating.
  • the 5 layer compound membrane is laminated in a single step to grant symmetrical inner tensions.
  • laminating methods There are different laminating methods; the preferred laminating method is a low pressure double belt press with at least 3 unwinders(X, Y, Z) and 2 rewinders (R, S).
  • the outer film layer A is mounted on the upper unwinder X.
  • the outer film layer B is mounted on the lower unwinder Z.
  • the 3 layer structure (Oi-C-O 2 ) with the protective release liner from production step one is mounted on the middle unwinder Y. Before the laminating process the protective release liner is removed with an impression roller to grant stable tensions, see Figure 3.
  • Unwind station X - Typical Tensions: 10- 1000 [N]
  • Unwind station Y - Typical Tensions: 10- 1000 [N]
  • Unwind station Z - Typical Tensions: 10-1000 [N]
  • Rewind station R - Typical Tensions: 30-1000 [N]
  • Specimen 1 sample 13A411 : comprising of ⁇ Aryphan PAR film outer layers, ⁇ acrylic adhesive layers and 12 ⁇ PET film core layer.
  • Specimen 2 sample 13A408: comprising of ⁇ Aryphan PAR film outer layers, ⁇ acrylic adhesive layers and 12 ⁇ PEEK Aptiv 1000 film core layer.
  • Specimen 2 displayed a higher fatigue resistance in relation to number of cycles, see figure 4.
  • Specimen 2 displayed a higher fatigue resistance in relation to stress span, see figure 4.
  • Specimen 1 displayed a higher crack growth rate, see figure 5.
  • Specimen 2 displayed a higher stress intensity factor, see figure 5.

Abstract

An acoustic compound membrane comprising: a central layer (C); a first glue layer (D1) attached to one side of the central layer (C); a second glue layer (D2) attached to another side of the central layer (C); an upper layer (A) provided on the first glue layer (D1); and a lower layer (B) provided beneath the second glue layer (D2); wherein the center layer (C) comprises material selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polybutadien Terephthalate (PBT), Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and Polyaryletherketone (PAEK, e.g. PEEK), and wherein the material of the upper layer (A) or the lower layer (B) is selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polyaryletherketone (PAEK, e.g. PEEK), Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and Polyarylate (PAR).

Description

Multilayer-compound membrane for electroacoustic transducers
The present invention relates to an acoustic compound membrane and to an acoustic device comprising such a compound membrane. The invention relates in particular to a polymeric multilayer-compound membrane, used in an electroacoustic transducer.
The requirements for membranes in acoustic transducers are widely spread, as there is the need for a balance between soft, thin materials, demanding a low resonant frequency and stiff, thick compounds, obtaining high sound pressures. Furthermore, the focus more and more lies on reasonably high lifetimes and temperature-stabilities of the membrane to guarantee long lasting performance of device.
To offer all these different kinds of requirements, special polymer compounds are used, e.g. building a five-layered compound membrane used in acoustic transducers. These different compounds are building a good over-all compromise of the mentioned properties with special emphasis on increased anti-fatigue performance.
BACKGROUND OF THE INVENTION/ DESCRIPTION OF RELATED ART
Electroacoustic transducers are used for varying kinds of loudspeakers, like micro-speakers for mobile-phones, notebooks, in-ear- or automotive applications. This field rapidly develops towards smaller construction components, keeping the same acoustic performance.
Nowadays monofilm-membranes reach their limits in terms of overall acoustic performance and other solutions have to be applied. Multi-layer membranes are built, using three-layered structures with relatively stiff polymer films as outer layers and soft glue layer ("damping layers") in-between. In many transducer applications, this sort of membranes also does not fully meet the requirements for high acoustic performance combined with long time endurance, especially at increased temperatures.
Polymeric film core-layers, having soft glue layers on both sides and polymeric films as outer layer on both surfaces are building five-layered structures. These structures were introduced to further increase performance mainly on long term. State-of-the-art five-layered compounds usually do have PET (Polyethylene Terephthalate)-films as a core layer and various polymer films as outer surface layers. These structures do have limits in terms of anti-fatigue and high temperature performance due to the nature of PET-core layer.
It is the objective of the present invention to provide a five-layer acoustic compound membrane with increased lifetime and high temperature stability and/or combination of both. The present invention is directed to an acoustic compound membrane comprising:
a central layer (C);
a first glue layer (D attached to one side of the central layer (C);
a second glue layer (D2) attached to another side of the central layer (C);
an upper layer (A) provided on the first glue layer (DO; and
a lower layer (B) provided beneath the second glue layer (D2);
wherein the center layer (C) comprises material selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polybutadien Terephthalate (PBT),
Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and Polyaryletherketone (PAEK, e.g. PEEK), and
wherein the material of the upper layer (A) or the lower layer (B) is selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polyaryletherketone (PAEK, e.g. PEEK), Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and
Polyarylate (PAR).
The glue layer is made of acrylics, silicones, thermoplastic elastomers (TPE) or thermoplastic urethanes (TPU).
The two outer layers do not necessarily have to be the same kind and their thickness may vary.
A preferred embodiment of the present invention is an acoustic compound membrane, wherein the material of the upper layer (A) and the lower layer (B) is Polyarylate (PAR) and wherein the material of the center layer (C) is Polyaryletherketone (PAEK, e.g. PEEK).
Specific application and transducer specification leads to defined material selection. All mentioned constructions show increased performance in mentioned properties because of enhanced characteristics of mentioned central film layers compared to state-of-the art.
Therefore, the present invention is also directed to an acoustic device comprising the inventive compound membrane. Figure 1 shows a five-layer compound membrane, comprising two outer layers (A, B) and an inner layer (C). The layers A and C, as well as C and B, are connected by glue layers (D^ D2).
The central, inner layer C is on both sides attached to the glue layers (D^ D2), where the second glue layer D2 is attached to a second outer layer B.
Layer A and B may consist either of the same or different materials and thicknesses.
The glue layers (D^ D2) are made of acrylics, silicones, thermoplastic elastomers (TPE) or thermoplastic urethanes (TPU).
PRODUCTION PROCESS
The Production has two main steps. In Production Step One shown in Figure 2 the glue layers (Pi; D2) are applied to both sides of the central film layer C. In Production Step Two shown in Figure 3 all layers are combined to form the compound membrane.
DETAILED DESCRIPTION PRODUCTION STEP ONE
The surface of both sides of the central film layer C is treated with a suitable method to increase the bonding properties. The method depends on chemical and mechanical properties of central film layer and adhesive glue layer. These treatments include corona, plasma and flame treatment. The central film layer C is coated simultaneously on both sides in one step. The diluent is dried in a hot air flotation dryer tunnel. The 3 layer structure (D^C-D^ is covered with a protective release liner form unwind station O and wound up on rewind station P, see Figure 2.
Typical Values:
Unwind station K: - Typical Tensions: 10-1000 [N]
Surface Treatment LI, L2: - Typical Corona Input: 1-25 [W min/m2]
Double sided coating Ml, M2: - Typical grammage: 5-50 [g/m2]
Floatation dryer N1-N6: - Typical Temperatures (depending on the diluent):
Nl: 50-120°C N2: 60-130°C N3: 60-140°C N4: 60-140°C N5: 60-150°C N6: 50-150°C
Unwind station O: - Typical Tensions: 10-1000 [N]
Rewind station P: - Typical Tensions: 30-1000 [N]
For producing the acrylic adhesive glue layer the preferred method is curtain coating. For producing the silicone adhesive glue layer the preferred method is multi roll coating. DETAILED DESCRIPTION PRODUCTION STEP TWO
The 5 layer compound membrane is laminated in a single step to grant symmetrical inner tensions. There are different laminating methods; the preferred laminating method is a low pressure double belt press with at least 3 unwinders(X, Y, Z) and 2 rewinders (R, S).
The outer film layer A is mounted on the upper unwinder X. The outer film layer B is mounted on the lower unwinder Z. The 3 layer structure (Oi-C-O2) with the protective release liner from production step one is mounted on the middle unwinder Y. Before the laminating process the protective release liner is removed with an impression roller to grant stable tensions, see Figure 3.
Typical Values:
Unwind station X: - Typical Tensions: 10- 1000 [N]
Unwind station Y: - Typical Tensions: 10- 1000 [N]
Unwind station Z: - Typical Tensions: 10-1000 [N]
Rewind station R: - Typical Tensions: 30-1000 [N]
Low pressure double belt press Q1-Q6: - Typical Pressure:
Ql : 1-10 bar Q2: 1-10 bar Q3: 1-15 bar Q4: 1-15 bar Q5: 1-10 bar Q6: 1-10 bar Low pressure double belt press Q1-Q6: - Typical Temperature:
Ql : 40-90°C Q2: 40-100°C Q3: 40-130°C Q4: 40-130°C Q5: 40-100°C Q6: 40-100°C Rewind station S: - Typical Tensions: 30- 1000 [N]
Improvements of life time of said five-layer membranes have been verified with dynamic fatigue testing according to DIN 50100 and ASTM E647. Therefore multi-layer laminates with same thicknesses of outer layers, core layer and adhesive layers were tested. All tested 5- layer membranes comprising of ΙΟμιη Aryphan PAR film as outer layers (A, B), ΙΟμιη acrylic adhesive layers (D^ D2) and 12μιη core layers of different polymeric films (C).
Specimen 1, sample 13A411 : comprising of ΙΟμιη Aryphan PAR film outer layers, ΙΟμιη acrylic adhesive layers and 12μιη PET film core layer.
Specimen 2, sample 13A408: comprising of ΙΟμιη Aryphan PAR film outer layers, ΙΟμιη acrylic adhesive layers and 12μιη PEEK Aptiv 1000 film core layer.
All specimens were cut in stripes of 15mm and notched 0.5mm on both sides. All samples were clamped with 45mm clamping length. All tests were done at a frequency of 100Hz which is within audible frequency range and covers application frequencies of micro speakers. All tests were performed at room temperature.
Specimen 2 displayed a higher fatigue resistance in relation to number of cycles, see figure 4. Specimen 2 displayed a higher fatigue resistance in relation to stress span, see figure 4.
Specimen 1 displayed a higher crack growth rate, see figure 5.
Specimen 2 displayed a higher stress intensity factor, see figure 5.

Claims

Claims:
1. An acoustic compound membrane comprising:
a central layer (C);
a first glue layer (D attached to one side of the central layer (C);
a second glue layer (D2) attached to another side of the central layer (C);
an upper layer (A) provided on the first glue layer (DO; and
a lower layer (B) provided beneath the second glue layer (D2);
wherein the center layer (C) comprises material selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polybutadien Terephthalate (PBT),
Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and Polyaryletherketone (PAEK, e.g. PEEK), and
wherein the material of the upper layer (A) or the lower layer (B) is selected from the group of Polyimide (PI, e.g. PEI), Polyethylene Naphthalate (PEN), Polyaryletherketone (PAEK, e.g. PEEK), Polyphenylensulfide (PPS), Polysulfone (PSU), Polycarbonate (PC) and
Polyarylate (PAR).
2. An acoustic compound membrane according to claim 1, wherein the material of the upper layer (A) and the lower layer (B) is Polyarylate (PAR) and wherein the material of the center layer (C) is Polyaryletherketone (PAEK, e.g. PEEK).
An acoustic device comprising a compound membrane according to claim 1 oder
PCT/EP2014/054317 2013-03-08 2014-03-06 Multilayer-compound membrane for electroacoustic transducers WO2014135620A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13158387 2013-03-08
EP13158387.4 2013-03-08

Publications (1)

Publication Number Publication Date
WO2014135620A1 true WO2014135620A1 (en) 2014-09-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018007372A1 (en) 2016-07-06 2018-01-11 Isovolta Ag Composite material for producing an acoustic membrane
CN110948988A (en) * 2019-11-05 2020-04-03 浙江旗声电子科技股份有限公司 Diaphragm material for loudspeaker and preparation method thereof

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS5962296A (en) * 1982-06-07 1984-04-09 Matsushita Electric Ind Co Ltd Method for forming diaphragm for speaker
JPS60139099A (en) * 1983-12-27 1985-07-23 Sumitomo Bakelite Co Ltd Speaker diaphragm
US20060222202A1 (en) * 2005-04-05 2006-10-05 Sony Corporation Acoustic vibratory plate
US20080199028A1 (en) * 2007-02-21 2008-08-21 Sony Corporation Speaker diaphragm and speaker including the same
US20100040246A1 (en) * 2006-11-08 2010-02-18 Nxp, B.V. Compound membrane, method of manufacturing the same, and acoustic device
US20110272208A1 (en) * 2010-05-04 2011-11-10 Tao Shen Compound membrane and acoustic device using same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5962296A (en) * 1982-06-07 1984-04-09 Matsushita Electric Ind Co Ltd Method for forming diaphragm for speaker
JPS60139099A (en) * 1983-12-27 1985-07-23 Sumitomo Bakelite Co Ltd Speaker diaphragm
US20060222202A1 (en) * 2005-04-05 2006-10-05 Sony Corporation Acoustic vibratory plate
US20100040246A1 (en) * 2006-11-08 2010-02-18 Nxp, B.V. Compound membrane, method of manufacturing the same, and acoustic device
US20080199028A1 (en) * 2007-02-21 2008-08-21 Sony Corporation Speaker diaphragm and speaker including the same
US20110272208A1 (en) * 2010-05-04 2011-11-10 Tao Shen Compound membrane and acoustic device using same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018007372A1 (en) 2016-07-06 2018-01-11 Isovolta Ag Composite material for producing an acoustic membrane
CN109417670A (en) * 2016-07-06 2019-03-01 奥地利依索沃尔塔股份公司 For producing the composite material of acoustic membrane
CN109417670B (en) * 2016-07-06 2021-09-17 奥地利依索沃尔塔股份公司 Composite material for producing acoustic membranes
CN110948988A (en) * 2019-11-05 2020-04-03 浙江旗声电子科技股份有限公司 Diaphragm material for loudspeaker and preparation method thereof
CN110948988B (en) * 2019-11-05 2022-04-01 浙江旗声电子科技股份有限公司 Diaphragm material for loudspeaker and preparation method thereof

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