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JPH11308695

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH11308695
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker edge made of a woven fabric or non-woven fabric as a base fabric, impregnated with an
impregnating resin, cured and molded, and a method of manufacturing the same.
[0002]
2. Description of the Related Art As an edge for a speaker, one based on woven or non-woven
fabric made of various fiber materials such as synthetic fiber and natural fiber is generally used.
[0003]
With regard to this base fabric, both woven and non-woven fabrics have both merits and
demerits, and currently it is used properly according to the application, but recently, when the
base fabric is a woven fabric, the directionality of the weave of the woven fabric The problem
that physical properties change due to (longitudinal and longitudinal anisotropy) occurs is
emphasized, and those based on non-woven fabrics are increasing.
[0004]
Conventionally, as an edge for a speaker of this type, for example, a nonwoven fabric formed by
interposing a polyurethane resin as a binder between polyester fibers as disclosed in JP-B-5828960, and impregnated with a phenol resin, A polyester fiber impregnated with a polyurethane
resin as disclosed in JP-A-4-88193 may, for example, be mentioned.
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[0005]
However, in the case of the former, the above-described conventional speaker edge is
impregnated with a phenol resin, so that the weight increases and the stretchability, which is the
most necessary physical property as the speaker edge, is increased. It had the problem of being
inferior.
In addition, the value of internal loss is also low, and it is easy to cause resonance of the edge
itself, and when this is used for a speaker, there is a disadvantage that distortion occurs in the
middle region.
[0006]
In the case of the latter, since the polyurethane resin is impregnated, the stretchability is greatly
improved compared to the former, but it is still not sufficient and the internal loss is not so high
either, so the edge itself tends to cause resonance as well. , Has the problem of inducing
distortion in the mid range in the speaker.
[0007]
Therefore, in view of the above situation, an object of the present invention is to provide a
speaker edge having a low density, an excellent stretchability, and a high internal loss.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the characterizing feature
of the speaker edge according to the present invention is based on a woven or non-woven fabric
as a base cloth, impregnated with an impregnating resin, and then cured and molded. It is an
edge for a speaker, and the resin for impregnating is made of a wet coagulating type resin mixed
with a pore forming agent, and obtained by wet coagulating the wet coagulating type resin in a
state where the pore forming agent is extracted. A point is obtained by molding an edge base
material in which capillary micropores are formed inside the resin, and examples of the wet
coagulation resin and the pore forming agent include polyurethane resin and
dimethylformamide, respectively. The base fabric impregnated with these is immersed in water to
wet coagulate the polyurethane resin, and elute the dimethylformamide to make the inside of the
polyurethane resin capillary-like. To form a Roporasu.
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[0009]
The base fabric is preferably a non-woven fabric, and the base fabric is preferably made of
polyamide fibers.
[0010]
Furthermore, it is also a preferable characteristic configuration that the non-woven fabric is
made of ultrafine fibers of 0.01 to 0.1 denier.
[0011]
In addition, as a method for producing an edge for a speaker, a base fabric made of a woven
fabric or a non-woven fabric is impregnated with a mixture of a polyurethane resin and
dimethylformamide, and then immersed in water to wet coagulate the polyurethane resin and
Formamide is eluted to form an edge substrate, and the edge substrate is molded with a mold.
[0012]
[Effect] In the speaker edge having such a configuration, for example, a pore forming agent such
as dimethylformamide is extracted from a wet coagulating resin such as polyurethane resin, for
example, and this portion becomes hollow to make capillary microporous Since it is formed, the
weight of the speaker edge can be reduced.
Furthermore, the degree of freedom of the capillary micro-porous portion improves the
stretchability of the resin itself, resulting in excellent stretchability as a speaker edge.
[0013]
Further, vibration damping is performed by the capillary microporous air layer, so the internal
loss is increased, resonance of the speaker edge is suppressed, and distortion in the middle
region of the speaker is reduced.
[0014]
Incidentally, although the resin for forming the speaker edge is, for example, a foamed resin such
as a foamed urethane resin, a cavity is formed inside the resin, but the formed cavity is in the
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form of relatively large bubbles, Since many are formed, bending rigidity becomes inferior as a
speaker edge by the action of this resin.
Furthermore, in this case, the base cloth is impregnated with the non-foamed resin and then
foamed by a predetermined reaction to form an edge for a speaker, making it difficult to adjust
the thickness of the molded product, and the characteristic of the foam There is a problem that
variation occurs in
[0015]
On the other hand, when the capillary microporous structure formed by the elution of the pore
forming agent is adopted, the bending rigidity is excellent, and since the elution is performed, the
thickness adjustment is easy and the variation of the characteristics does not occur.
[0016]
The base fabric contained in the speaker edge is preferably a non-woven fabric in that the
directionality of the weave of the fibers does not occur, and if the fibers used for this are ultrafine
fibers of 0.01 to 0.1 denier, the fibers are The entanglement between each other is good, the
tensile strength is improved, and the maintenance of the vibration system works well.
[0017]
Moreover, when the fiber which comprises a base fabric is made into a polyamide fiber, it is
excellent also in heat-and-moisture resistance.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
[0019]
The base fabric used in the present invention is made of woven or non-woven fabric, and may be
a single layer or multiple layers.
Examples of fibers constituting these woven or non-woven fabrics include polyester fibers such
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as polyethylene terephthalate, polyolefin fibers such as polypropylene and polyethylene,
polyamide fibers such as 6-nylon and 6,6-nylon, and aramid fibers. When making it into a cloth
or a nonwoven fabric, you may comprise by these single fiber materials, and you may mix and
comprise several fiber materials.
That is, in the case of a single layer, it is composed of a single fiber material or a mixture of a
plurality of fiber materials, and in the case of multiple layers, lamination of the same woven
fabric or non-woven fabric configured in this way, lamination of different nonwoven fabrics It
consists of
Among the above-mentioned fiber materials, polyamide fibers are preferable from the viewpoints
of the retention of the vibration system, the stretchability, and the heat and humidity resistance,
and the direction of the weave of the fibers does not occur when such a fiber material is a nonwoven fabric. preferable.
[0020]
When the base fabric is a non-woven fabric, the non-woven fabric may be produced by, for
example, a method of mechanically entangled fibers mechanically, such as needle punching, fluid
entanglement with various liquids such as water, or various gases such as air, etc. Various
products are marketed for the nonwoven fabric obtained by such a manufacturing method.
[0021]
In addition, the woven or non-woven fabric generally contains a binder resin, and may contain a
pigment, a reinforcing material and the like depending on various uses.
[0022]
As the pigment, those of various color types are used depending on the purpose of coloring, but
black pigments and the like are mainly used.
[0023]
As a reinforcing material, carbon fiber, glass fiber, etc. are generally used.
[0024]
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In the edge for a speaker according to the present invention, the woven or non-woven fabric is
impregnated with a wet-setting resin in which a pore-forming agent is dispersed and mixed, and
then immersed in a reaction liquid for coagulating the resin, for example. The wet coagulating
resin is coagulated.
At that time, the pore forming agent is eluted, or after solidification of the resin, the pore forming
agent is extracted by elution or the like.
[0025]
As a wet coagulation type resin, a polyurethane resin etc. are mentioned, for example.
Such a polyurethane resin is solidified by immersion in water or by applying steam since it
solidifies with water.
Then, although the pore forming agent is extracted, if the polyurethane resin is coagulated by
water immersion using dimethylformamide having a property of dissolving the polyurethane
resin and being soluble in water as the pore forming agent, the polyurethane resin At the same
time, the pore forming agent (dimethylformamide) can be eluted at the same time as the
solidification of the solution, and the coagulation of the wet coagulation resin and the extraction
of the pore forming agent can be performed in the same step.
It is needless to say that the same one can be produced by coagulating the polyurethane resin
with steam and then eluting dimethylformamide by immersion in water.
Whether coagulation of the wet coagulation resin and extraction of the pore forming agent are
performed in the same step or in separate steps may be appropriately selected according to the
type of the wet coagulation resin, the pore forming agent, and the reaction liquid. The types of
the wet coagulating resin, the pore forming agent, and the reaction liquid may be appropriately
selected according to various applications.
[0026]
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Next, using a polyurethane resin as a wet coagulation resin and dimethylformamide as a pore
forming agent, a mixed solution in which these are dispersed and mixed is impregnated into a
predetermined woven or non-woven fabric and then immersed in water, this main step An
embodiment of a method for producing a speaker edge will be described with reference to FIG.
[0027]
First, the base fabric made of the above-mentioned woven fabric or non-woven fabric is dipped in
a dip tank into which a polyurethane resin in which dimethylformamide is dispersed and mixed is
injected to impregnate these (not shown).
The material obtained thereby is rolled and held in the material supply device 1.
This material is delivered according to the process flow.
The material guided to the guide roller 2 is supplied to the immersion tank 3.
The state in the immersion layer 3 is shown in the lower part of FIG.
In this figure, 10 is a woven or non-woven fabric, 11 is a dispersion mixed layer of a
polyurethane resin and dimethylformamide (DMF), 12 is water, and it shows that
dimethylformamide (DMF) is eluted.
When dimethylformamide is removed and the polyurethane resin coagulates, capillary
polyurethane is formed in the polyurethane resin layer.
The material in such a state is supplied to the dryer 5 by the transport rollers 4a and 4b, and is
dried with hot air to remove moisture.
In general, in such a process, drying is performed immediately by hot air, but if there is no
process in the next stage, natural drying may be performed. The dried material is delivered while
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having a predetermined thickness by the pressure rollers 6a and 6b, and is wound into a roll by
the winding device 7.
[0028]
The edge base material formed through such a process is cut into an appropriate shape by a
rotary blade, a cutting blade, etc., and is then heat and pressure molded by a predetermined
mold, and further die cutting and inner / outer circumference cutting are performed. The speaker
edge is obtained.
[0029]
In the above-described steps, the heating temperature, the pressing pressure, the pressing
interval and the like are appropriately adjusted in accordance with the physical properties of the
woven or nonwoven fabric, the wet coagulation resin, and the use of the speaker edge.
[0030]
In addition, the shape of the speaker edge can be formed in an up / down roll shape, a gather
shape, or the like.
[0031]
EXAMPLES Examples of the present invention will be described below.
[0032]
[Examples] A mixture of polyamide resin 6,6-nylon and polyester resin at a weight ratio of 65:35
is used to form a web as a mixed spinning fiber of 3 to 3.5 denier.
Then, the needle plate with needle is reciprocated up and down, part of the two-dimensional
random fiber array constituting the web is transferred in the thickness direction of the web, socalled three-dimensional random bonding is performed to form a non-woven fabric .
[0033]
The felt was immersed in 0.5 N caustic soda (NaOH) to completely remove the polyester fibers, to
prepare a nonwoven fabric for a base fabric comprising only 0.01 to 0.1 denier ultrafine
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polyamide fibers.
[0034]
The nonwoven fabric for a base fabric is impregnated with a polyurethane resin solution with a
resin concentration of 30 to 35% using dimethylformamide as a solvent.
Then, immediately after the impregnation, it is immersed in water.
By immersing in water, the polyurethane resin which is a wet coagulating resin is coagulated, and
the solvent dimethylformamide is eluted in water to form capillary micropores inside the
polyurethane resin.
If the resin concentration of the polyurethane resin solution is 30 to 35%, it is insufficient as a
binder for non-woven fabrics at 30% or less, resulting in strength reduction and reduction of the
expansion ratio, and at 35% or more, capillaries inside the resin This is because the micropores
are not uniformly formed.
[0035]
In this state, the sheet taken out of water was dried and pressed by a pressure roller to prepare a
sheet having a thickness of 1.4 mm and a basis weight of 450 g / m 2.
[0036]
Then, this sheet is sliced using a rotary blade so as to have a thickness of 0.5 to 0.65 mm to a
basis weight of 180 to 200 g / m 2, and a clearance of 0.45 to 0. It shape ¦ molded for 10
seconds on conditions of 5 mm, and obtained the edge for speakers.
Comparative Example 1 The fibers constituting the non-woven fabric are polyester fibers and
bonded with a polyurethane resin having a resin concentration of 30 to 35%, and then
impregnated with a phenol resin at a resin concentration of 5 to 10% to have a thickness of 0.5
to 0.5 A sheet with a basis weight of 180 to 200 g / m @ 2 was prepared.
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This sheet was molded in the same manner as in Example except that only the mold temperature
was 180 ° C. to obtain a speaker edge. Comparative Example 2 A speaker edge was obtained in
the same manner as in Comparative Example 1 except that no phenol resin was impregnated in
Comparative Example 1.
[0037]
Next, the physical properties of this example and the respective physical properties of
Comparative Examples 1 and 2 are shown in Table 1.
[0038]
As apparent from Table 1, the speaker edge of the example has a density lower than that of the
speaker edges of Comparative Examples 1 and 2 and has excellent values of both stretchability
and internal loss.
These physical properties are not due to the material of the fibers constituting the non-woven
fabric, but are the results of the remarkable effects of capillary micropores.
[0039]
In Table 2, the value of each elastic modulus of Example and Comparative Example 2 is shown.
[0040]
As shown in Table 2, it is clear that the speaker edge of the example has high flexural modulus
and tensile modulus, and is excellent in the retention and stretchability of the vibration system.
These physical property differences are also dependent on differences in fiber materials, but also
on the configuration of capillary micropores.
[0041]
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Also, for the example and the comparative example 2, FIG. 2 shows the results of the moisture
resistance heat acceleration test (80 ° C., 95%) of each speaker edge, and FIG. 3 shows the
frequency characteristics of the speaker using each speaker edge (axis The upper 50 cm, input 1
W) is shown in FIG. 4, and harmonic distortion characteristics in the entire band are shown in
FIG. In FIG. 3, a thick line indicates sound pressure, a dotted line indicates second-order
distortion, and a thin line indicates third-order distortion. In FIG. 4, a solid line indicates an
example and a dotted line indicates comparative example 2. In addition, as a diaphragm of a
speaker, a cone-shaped diaphragm made of polypropylene and having a diameter of 16 cm was
used. Moreover, the total harmonic distortion in FIG. 4 uses the data of 2nd distortion, 3rd
distortion, and sound pressure represented in FIG. 3, and ([2nd distortion] + [3rd distortion]) /
[sound pressure] It calculated ¦ required by x100.
[0042]
As shown in FIG. 2, it can be seen that the speaker edge of the example has less decrease in
strength retention rate due to elapsed time and is excellent in moisture and heat resistance as
compared with the comparative example 2. This is a result of the difference in the material of the
fibers constituting the non-woven fabric.
[0043]
Further, as shown in FIGS. 3 and 4, in the speaker using the speaker edge of the embodiment, the
distortion of the mid range around 1 kHz is reduced due to the effect of the capillary
microporous included in the speaker edge. By this, the peak dip of the sound pressure in this
band is improved.
[0044]
Although the speaker edge according to the present invention has been described in detail based
on the embodiment considered to be representative, the embodiment of the speaker edge
according to the present invention is not limited to the configuration of the above-described
embodiment, and As long as it has the configuration requirements described in the appended
claims and has the effects of the present invention, it can be appropriately modified and
implemented.
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