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JP2010043390

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DESCRIPTION JP2010043390
To provide an edge for a speaker which is excellent in stretchability and high in waterproofness.
SOLUTION: A sheet-like material in which an elastic polymer adheres to a non-woven fabric
formed by entanglement of ultrafine fibers having an average fiber diameter of 0.3 to 7.0 μm
and a long-fiber non-woven fabric are laminated. Edge material for speakers characterized by 【
Selection chart】 None
Speaker edge material
[0001]
The present invention relates to a speaker edge material for holding and controlling an operation
of a diaphragm at an outer peripheral portion of the speaker diaphragm.
[0002]
The speaker edge is used on the outer peripheral portion of the diaphragm to control the holding
of the speaker diaphragm and its operation.
The properties required for the material include that there is no vertical or horizontal anisotropy,
that it is lightweight, that it has elasticity, that its mechanical internal loss (tan δ) is large, etc. As
a thing which satisfy | fills, the sheet-like article which provided resin to the nonwoven fabric
which consists of microfibers has been used suitably (patent documents 1, 2).
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1
[0003]
However, these materials have high water absorption characteristics due to low apparent density,
and it has been difficult, for example, to be used as an on-vehicle speaker that is likely to come in
contact with water. With respect to the said subject, in patent document 3, the speaker edge by
which one or both surfaces are covered with elastomers, such as rubber | gum, is disclosed.
However, by having a rubber-like layer, there has been a problem that the lightness and
stretchability inherent to the base material are impaired. JP 07-184295 A JP 11-308 695 JP A
2007-266721 A
[0004]
An object of the present invention is to provide a speaker edge that is excellent in elasticity and
waterproof.
[0005]
That is, according to the present invention, a sheet-like material in which an elastic polymer
adheres to a non-woven fabric formed by entanglement of ultrafine fiber bundles having an
average fiber diameter of 0.3 to 7.0 μm and a long-fiber non-woven fabric It is an edge material
for speakers characterized by the above.
[0006]
According to the present invention, it is possible to provide a speaker edge having both
stretchability and waterproofness, which was conventionally difficult to achieve.
[0007]
The edge material for a speaker according to the present invention is also referred to as a nonwoven fabric (hereinafter, also referred to as "ultra-fine fiber bundle non-woven fabric") in which
bundles of ultra-fine fibers are intertwined.
And the sheet-like material which an elastic polymer adheres.
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[0008]
As a polymer which forms an ultrafine fiber, polyester, polyamide, polyolefin etc. are mentioned.
Among them, polycondensation polymers represented by polyesters and polyamides are more
preferable because they have high melting point and high durability.
Specific examples of the polyester may include polyethylene terephthalate, polybutylene
terephthalate and potassium trimethylene terephthalate, and specific examples of the polyamide
may include nylon 6, nylon 66, nylon 12 and the like. In addition, other components may be
copolymerized with the polymer. Further, the polymer may contain additives such as particles,
flame retardants, antistatic agents and the like.
[0009]
The average fiber diameter of the ultrafine fibers is important to be 0.3 to 7.0 μm. By setting the
thickness to 7.0 μm or less, preferably 5.0 μm or less, a good surface quality can be obtained.
On the other hand, by setting the thickness to 0.3 μm or more, preferably 0.5 μm or more, an
internal loss (tan δ) necessary as a speaker edge can be obtained, and sufficient strength as a
speaker edge can be maintained.
[0010]
As a form of the bundle of microfibers, single fibers may be separated, may be partially bonded,
or may be aggregated.
[0011]
As the ultrafine fiber bundle non-woven fabric, a short fiber non-woven fabric is preferable
because it has small vertical and horizontal anisotropy and good quality.
[0012]
The elastic polymer in the sheet of the edge material for a speaker according to the present
invention maintains the form of the edge for the speaker and contributes to imparting
appropriate rigidity and cushioning property.
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[0013]
As the elastic polymer, for example, polyurethane, polyurea, polyurethane-polyurea elastomer,
polyacrylic acid, acrylonitrile-butadiene elastomer, styrene-butadiene elastomer, etc. can be used.
[0014]
Among them, polyurethane elastomers such as polyurethane and polyurethane / polyurea
elastomer are preferable.
As the polyol component of the polyurethane elastomer, polyester based, polyether based,
polycarbonate based diol, or copolymer of these can be used.
Moreover, as a diisocyanate component, aromatic diisocyanate, alicyclic isocyanate, aliphatic
isocyanate etc. can be used.
[0015]
The weight average molecular weight of the polyurethane is preferably 50,000 to 300,000.
By maintaining the weight-average molecular weight at 50,000 or more, more preferably
100,000 or more, more preferably 150,000 or more, the strength of the sheet-like material and
thus the edge for the speaker can be maintained, and the detachment of the microfibers can be
prevented. Can.
Further, by setting the viscosity to 300,000 or less, more preferably 250,000 or less, it is
possible to suppress the increase in the viscosity of the polyurethane solution and to facilitate the
impregnation into the ultrafine fiber bundle nonwoven fabric.
[0016]
Further, the elastic polymer may contain an elastomer resin such as polyester, polyamide or
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polyolefin, an acrylic resin, an ethylene-vinyl acetate resin, and the like.
[0017]
In addition, the elastic polymer may be blended with additives such as a colorant, an antioxidant,
an antistatic agent, a dispersing agent, a softener, a coagulation regulator, a flame retardant, an
antibacterial agent, a deodorant and the like as necessary. It is also good.
[0018]
The content of the elastic polymer is preferably 5 to 200% by mass with respect to the ultrafine
fiber bundle nonwoven fabric.
The surface condition, cushioning property, hardness, strength and elongation, and the like of the
speaker edge can be adjusted by the content.
By setting the content to 5% by mass or more, more preferably 20% by mass or more, and further
preferably 30% by mass or more, the fiber detachment can be reduced. On the other hand, when
the content is 200% by mass or less, more preferably 100% by mass or less, further preferably
80% by mass or less, processability and productivity are improved, and a state in which
microfibers are sufficiently dispersed on the surface is obtained. be able to.
[0019]
In the edge material for a speaker of the present invention, it is preferable that the surface on the
opposite side of the lamination with the long-fiber non-woven fabric described later of the sheet
material including the ultra-fine fiber bundle non-woven fabric has napped hairs consisting of
ultra-fine fibers. By doing so, the surface quality can be improved, and the internal loss as a
speaker edge can be improved.
[0020]
It is important that the edge material for a speaker according to the present invention be formed
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by further laminating a long-fiber non-woven fabric on a sheet-like material containing the
above-mentioned ultra-fine fiber bundle non-woven fabric. The long-fiber non-woven fabric can
impart water repellency to the speaker edge without inhibiting the stretchability of the sheet-like
material including the ultrafine fiber bundle non-woven fabric.
[0021]
As a polymer which forms the fiber of a long-fiber non-woven fabric, polyolefin is preferably
used from the viewpoint of imparting water repellency. As an example of polyolefin,
polyethylene, polypropylene or the like can be adopted.
[0022]
As long-fiber non-woven fabrics, melt-blown non-woven fabrics have appropriate elongation, do
not inhibit the properties of ultra-fine fiber bundle non-woven fabrics, have excellent uniformity
of areal weight and are easily reduced in weight, and polymers giving water repellency It is
preferable because it is easy to adopt.
[0023]
As an average fiber diameter of the fiber of a long fiber nonwoven fabric, 0.01-50 micrometers is
preferable.
When the thickness is 50 μm or less, more preferably 30 μm or less, and further preferably 20
μm or less, the uniformity of the fabric weight is excellent. On the other hand, by setting the
thickness to 0.01 μm or more, more preferably 0.1 μm or more, further preferably 0.5 μm or
more, the strength of the long-fiber non-woven fabric can be maintained, and the cross points
between the fibers increase and the air permeability is increased. Waterproofness is improved by
lowering.
[0024]
As a fabric weight of a long fiber nonwoven fabric, 40-80 g / m <2> is preferable. By setting it as
40 g / m <2> or more, sufficient water repellency can be provided to a sheet. On the other hand,
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by setting the ratio to 80 g / m <2> or less, more preferably 70 g / m <2> or less, the
stretchability of the sheet can be maintained.
[0025]
As a fabric weight of the edge material for speakers of this invention, 100-600 g / m <2> is
preferable. By setting it as 100 g / m <2> or more, more preferably 150 g / m <2> or more, the
shape stability and dimensional stability of the edge for a speaker are excellent. On the other
hand, the attachment processability to a speaker is excellent by setting it as 600 g / m <2> or
less, more preferably 300 g / m <2> or less.
[0026]
Moreover, as thickness of the edge material for speakers of this invention, 0.2-10 mm is
preferable. When the thickness is 0.2 mm or more, preferably 0.3 mm or more, the shape
stability and dimensional stability of the speaker edge are excellent. On the other hand, the
attachment processability to a speaker is excellent by setting it as 10 mm or less, more
preferably 5 mm or less.
[0027]
The edge material for a speaker according to the present invention preferably has an elongation
at break of 50 to 150% in the vertical direction and in the horizontal direction after pressing at a
temperature of 170 ° C. and a pressure of 0.5 MPa. When the content is 50% or more, sufficient
followability can be maintained, and when the content is 150% or less, the shape retention
characteristic of the speaker edge can be secured.
[0028]
The edge material for a speaker according to the present invention is JIS L 1092: 1998 6.1. After
pressing at a temperature of 170 ° C. and a pressure of 0.5 MPa. It is preferable that the water
pressure resistance by method A is 30-150 cmH2O. Sufficient waterproofness can be obtained by
setting it as 30 cmH2O or more. On the other hand, by setting the thickness to 150 cmH 2 O or
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less, the properties of the base material such as stretchability can be maintained.
[0029]
Next, the method for producing the speaker edge material of the present invention will be
described.
[0030]
As a means for obtaining an ultrafine fiber bundle nonwoven fabric, it is preferable to use an
ultrafine fiber generating type fiber.
Although it is difficult to produce an ultrafine fiber bundle nonwoven fabric directly from an
ultrafine fiber, an ultrafine fiber bundle is produced by producing an ultrafine fiber from an
ultrafine fiber generation type fiber from the ultrafine fiber generation type fiber and generating
an ultrafine fiber from this ultrafine fiber generation type fiber. Nonwoven fabrics can be
obtained.
[0031]
As an ultrafine fiber generation type fiber, a sea island type fiber in which an island component is
made as an ultrafine fiber by dissolving and removing a thermoplastic resin of two components
different in solvent solubility as a sea component and an island component and dissolving the sea
component using a solvent A releasable composite fiber or the like can be adopted, in which
thermoplastic resins of two or more components are alternately arranged in a radial or multilayered manner in a fiber cross section and each component is separated and separated into
ultrafine fibers.
[0032]
Sea-island type fibers include sea-island type composite fibers in which two components of sea
and island are mutually arrayed and spun by using a base for sea-island composite, and mixed
spun fibers in which two components of sea and island are mixed and spun. However, a seaisland composite fiber is more preferable in that ultrafine fibers having a uniform fineness can be
obtained, and also ultrafine fibers having a sufficient length can be obtained to contribute to the
strength of the sheet-like material.
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[0033]
As the sea component of the islands-in-the-sea fiber, polyethylene, polypropylene, polystyrene,
copolymerized polystyrene, copolymerized polyester containing sodium sulfoisophthalic acid,
polyethylene glycol or the like as a copolymer component, polylactic acid, thermoplastic PVA
based resin, etc. may be used it can.
[0034]
The dissolution and removal of the sea component may be performed at any timing after
application, after raising and after application of the elastic polymer.
[0035]
As a method of obtaining the non-woven fabric, a method of intertwining the web with a needle
punch or a water jet punch, a spun bond method, a melt blow method, a paper making method or
the like can be adopted.
Among them, in order to impart sufficient strength to the non-woven fabric and to improve the
quality of the non-woven fabric by raising the entanglement of the fibers, it is preferable to
undergo processing such as needle punch and water jet punch.
[0036]
In the needle punching process, one to three barbs are preferable.
With one or more fibers, efficient fiber entanglement is possible.
On the other hand, fiber damage can be suppressed by setting it to three or less.
[0037]
The number of needle punches to be punched is preferably 500 to 8,000 / cm <2>.
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By setting the density to 500 / cm <2> or more, compactness can be obtained, and a highly
accurate finish can be obtained. On the other hand, by setting the density to 8000 / cm <2> or
less, deterioration in processability, fiber damage, and strength reduction can be prevented.
[0038]
Moreover, when performing a water jet punch process, it is preferable to perform water in the
state of a columnar flow. Specifically, it is preferable to eject water at a pressure of 1 to 60 MPa
from a nozzle having a diameter of 0.05 to 1.0 mm.
[0039]
As an apparent density of the microfiber generation type fiber nonwoven fabric after a needle
punch process or a water jet punch process, 0.15-0.30 g / cm <3> is preferable. By setting it as
0.15 g / cm <3> or more, it is excellent in form stability and dimensional stability of a polishing
cloth, and can suppress generation | occurrence | production of the processing nonuniformity by
the expansion of the polishing cloth at the time of polishing processing, and a scratch defect. On
the other hand, by setting the concentration to 0.30 g / cm <3> or less, a sufficient space for
applying the elastic polymer can be maintained.
[0040]
From the viewpoint of densification, it is preferable that the thus-obtained ultrafine fiber-forming
fiber nonwoven fabric be shrunk by dry heat or wet heat, or both, to be further densified.
[0041]
As a solvent for dissolving easily soluble polymers (sea component) from ultrafine fibergenerating fibers, in the case of polyolefins such as polyethylene and polystyrene, organic
solvents such as toluene and trichloroethylene, and in the case of polylactic acid and copolyester,
sodium hydroxide And the like, and in the case of a thermoplastic PVA-based resin, hot water can
be used.
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The ultrafine fiber generation process (sealing treatment) can be performed by immersing the
ultrafine fiber-generating fiber non-woven fabric in a solvent and causing the solution to flow.
[0042]
In addition, microfiber generation processing may be performed before napping treatment or
may be performed after napping treatment.
[0043]
The elastic polymer may be applied before or after the microfiber generation processing.
[0044]
As a solvent used when providing an elastic polymer, N, N'- dimethylformamide,
dimethylsulfoxide etc. can be used preferably.
In addition, it may be a water-based polyurethane dispersed as an emulsion in water.
[0045]
The elastic polymer is applied to the nonwoven fabric by, for example, immersing the nonwoven
fabric in an elastic polymer solution dissolved in a solvent, and then the elastic polymer is
substantially solidified and solidified by drying.
The drying may be performed at a temperature that does not impair the performance of the nonwoven fabric and the elastic polymer.
[0046]
The napping treatment can be performed using a sandpaper or a roll sander. Furthermore, in
order to form a uniform nap on the surface of the speaker edge material, it is preferable to
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reduce the grinding load. In order to reduce the grinding load, for example, it is more preferable
to set the number of buff stages to multistage buffing of three or more stages and to set the
number of the sandpaper used in each stage within the range of 150 to 600 specified by JIS.
[0047]
As a method of laminating a long fiber non-woven fabric on a sheet-like article containing an
ultrafine fiber bundle non-woven fabric, for example, a method of collecting long fibers directly
on a sheet-like article containing an ultrafine fiber bundle non-woven fabric by melt blowing It is
preferable from the viewpoint of processability, adhesiveness and the like.
[0048]
At the time of use, the speaker edge material is subjected to heat press molding, but the
conditions of the press molding can be appropriately changed according to the design of the
speaker edge.
The mold temperature is preferably 100 to 180 ° C., the press pressure is preferably 0.1 to 1.0
MPa, and the heating time is preferably 5 to 40 seconds.
[0049]
[Measuring method / Processing method for evaluation] (1) Melting point A peak top
temperature indicating melting of the polymer in 2nd run was defined as the melting point of the
polymer using DSC-7 manufactured by Perkin Elmer. The temperature rising rate at this time was
16 ° C./min, and the sample amount was 10 mg.
[0050]
(2) Melt flow rate (MFR) 4 to 5 g of sample pellets are placed in a cylinder of an MFR electric
furnace, and under the conditions of a load of 325 gf and a temperature of 270 ° C., outer
diameter 9.5 mm, inner diameter 2.0955 mm, height 8 mm The amount (g) of resin extruded in
10 minutes from an orifice having a vertical hole of 1 mm was measured. The same
measurement was repeated three times, and the average value was taken as MFR.
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[0051]
(3) Average fiber diameter of ultrafine fibers The cross section parallel to the thickness direction
of the non-woven fabric is observed with a scanning electron microscope (VE-7800 type
manufactured by SEM Keyence Co., Ltd.) at 3000 times and randomly selected within a 30 μm
× 30 μm field of view The diameter of 50 single fibers extracted into was measured. This was
done in three places, and the average value of the diameter of a total of 150 single fibers was
calculated. In the case where the ultrafine fiber is a deformed cross section, the cross sectional
area of the single fiber is first measured, and the diameter of the single fiber is determined by
calculating the diameter of the circle having the same area as the cross sectional area.
[0052]
(4) Fabric weight Measured according to JIS L 1906: 2000. Three 20 cm × 20 cm test pieces
were collected, and their respective mass (g) were measured, and the average value was
represented by mass per 1 m <2> (g / m <2>).
[0053]
(5) Thickness Measured according to JIS L 1096: 1999 8.5, which is applied to JIS L 1906: 2000.
Measure thickness after waiting 10 seconds to settle the thickness under pressure of 23.5 kPa
using thickness measuring machine (“Pecock” (registered trademark) H made by Ozaki Mfg.)
For 5 different places of the sample Average value was calculated.
[0054]
(6) Apparent Density The apparent density was determined by dividing the value of the basis
weight measured as described above by the thickness value.
[0055]
(7) Press treatment The edge material for a speaker was pressed at a roll temperature of 170 °
C., a press pressure of 0.5 MPa, and a feed rate of 0.5 m / min with a pair of flat rolls made of
steel and having a roll diameter of 60 cm.
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[0056]
(8) Elongation at break Measured according to JIS L 1906: 2000.
For each of the vertical direction and the horizontal direction of the speaker edge material
subjected to the pressing process, 20 pieces of sample pieces each having a width of 1 cm and a
length of 20 cm were collected.
The sample piece is attached to a constant speed elongation tensile tester with a grip interval of
10 cm in a state where the sample piece is pulled so as not to cause slack by hand, a load is
applied until the sample piece breaks at a tensile speed of 10 cm / min, and maximum elongation
is obtained. The elongation at break was taken, and the average value was calculated for each of
the vertical direction and the horizontal direction.
[0057]
(9) Water pressure resistance (low water pressure method) JIS L 1092: 1998 6.1. It measured
according to method A (low water pressure method). Five pieces of 15 cm x 15 cm test pieces are
collected from the edge material for speakers subjected to the above-mentioned pressing
treatment, attached to the water resistance tester so that the long fiber non-woven fabric is
laminated so that the long fiber non-woven fabric side hits water. The leveling device inserted is
raised at a speed of 10 cm / min to raise the water level, and the water level is measured when
water comes out from three places on the back side of the test piece, and the average value of the
five measurements is calculated. did.
[0058]
(10) tan δ Measured by the vibration lead method.
[0059]
Example 1 (Sheet-like material containing ultrafine fiber bundle nonwoven fabric) PET having a
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melting point of 263 ° C. and MFR 2.5 was used as an island component, and polystyrene
having a melting point 87 ° C. and MFR 18 was used as a sea component.
Spinning temperature 285 ° C, island / sea mass ratio 55/45, discharge rate 1.2 / min, hole,
spinning speed 1240 m using the above sea component and island component and using an
island / hole composite spinneret of 36 islands / hole Melt spun at 1 / minute. Next, it is drawn
3.5 times in a liquid bath at 90 ° C., crimped with an push-in crimper, cut, and raw cotton of
sea-island composite fiber with a fineness of 2.9 dtex and a fiber length of 51 mm. I got The
above raw cotton was used to form a laminated web through a card and cross wrapper process.
Next, needle punching is performed with a needle depth of 7 mm and a punch number of 3000 /
cm <2> with a needle punching machine in which a 1 barb needle with a total barb depth of 0.08
mm is implanted, and the surface weight 595 g / m <2>, apparent An ultrafine fiber-generating
fibrous nonwoven fabric having a density of 0.23 g / cm <3> was produced. After making the
said ultrafine fiber generation | occurence | production fiber nonwoven fabric hot-water
shrinkable at 95 degreeC, it was made to dry, after giving polyvinyl alcohol 24 mass% with
respect to the fiber mass. To this non-woven fabric, a polyurethane composed of 75% by mass of
polyether based and 25% by mass of polyester based is applied in a solid content of 23% by mass
relative to the fiber mass, and the liquid temperature is 35 ° C. 30% N, N The polyurethane is
coagulated with an aqueous solution of dimethylformamide (DMF), and the hot water at about 85
° C. removes the DMF and polyvinyl alcohol. Then, it was semi-cut in the thickness direction by
a semi-finishing machine having an endless band knife, and the non-half-cut surface was ground
in three stages with a JIS # 320 sand paper to form raised hair. Then, at a density of 20% owf of
blue disperse dye ("Sumikaron" Blue S-BBL 200 manufactured by Sumika Chemtex Co., Ltd.) in a
jet flow dyeing machine, the dye is dyed in a jet flow dyeing machine at 120 ° C for 45 minutes.
It was dried with C to obtain a sheet-like material containing the ultrafine fiber bundle nonwoven
fabric. The sheet-like material had an average fiber diameter of ultrafine fibers of 2.1 μm, a
thickness of 0.51 mm, a basis weight of 172 g / m <2>, and an apparent density of 0.337 g / cm
<3>.
[0060]
(Edge material for speakers) The amount of discharge 300 g / min from the melt-blown fabric
device with a width of 1200 mm, in which the polypropylene of MFR 800 is melted and
discharge holes 1201 with a diameter of 0.4 mm are arranged in a straight line at 1 mm hole
pitch. The polypropylene fiber is jetted at a nozzle temperature of 280 ° C. and an air pressure
of 0.05 MPa, placed on the collecting conveyor of the melt-blowing clothing apparatus and
collected on the sheet-like material traveling at 5.5 m / min. A melt-blown nonwoven fabric
having a basis weight of 45 g / m <2> was integrally laminated to obtain an edge material for a
speaker.
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[0061]
[Example 2] (Sheet-like material containing ultrafine fiber bundle nonwoven fabric) The same one
as used in Example 1 was used.
[0062]
(Edge Material for Speaker) In the same manner as in Example 1 except that the basis weight of
the meltblown non-woven fabric was 65 g / m <2> by setting the traveling speed of the sheet to
3.8 m / min, the speaker edge material was used. Made.
[0063]
Comparative Example 1 (Sheet-like material containing ultrafine fiber bundle nonwoven fabric)
The same one as used in Example 1 was used.
[0064]
(Edge Material for Speaker) A long fiber non-woven fabric is not laminated, and a sheet-like
material including the above-mentioned ultrafine fiber bundle non-woven fabric is used as an
edge material for speaker as it is.
The obtained edge material for a speaker has a low water pressure resistance and can not be
applied to an on-vehicle speaker required to be waterproof.
[0065]
Comparative Example 2 (Sheet-like material containing ultrafine fiber bundle nonwoven fabric)
The same one as used in Example 1 was used.
[0066]
(Edge Material for Speaker) A long fiber non-woven fabric is not laminated, and instead, an SBR
(styrene butadiene rubber) having a basis weight of 50 g / m <2> is integrally laminated by
calendering to form a speaker edge material.
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The obtained speaker edge material was not suitable for use because its processability and ability
to follow vibrations were poor because its elongation at break was low.
[0067]
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