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JPH0470099

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DESCRIPTION JPH0470099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a loudspeaker diaphragm containing chitin. 2. Description of the
Related Art Generally, physical properties to be provided for a speaker diaphragm include a light
weight, a large elastic modulus, and a large internal loss. Considering the characteristics of the
conventional speaker diaphragm from this point of view, first, the paper diaphragm made of
wood valve made of paper, which is used more often than before, is relatively lightweight, and
the internal loss is large. However, the modulus of elasticity is so small that it is not always
satisfactory as a speaker diaphragm. On the other hand, a speaker diaphragm manufactured by
molding a high elastic fiber woven fabric such as carbon fiber has a drawback that although a
large elastic modulus can be obtained, the internal loss is small and a lightweight diaphragm can
not be obtained. . Therefore, a paper speaker diaphragm containing chitin is newly proposed.
This chitin is a substance that constitutes the wing of the insect wing or the epidermis of the
crustacean, is a natural polymer that is lightweight and has a large elastic modulus and a large
internal loss, and by including this chitin, as a speaker diaphragm The characteristics of can be
improved. Such a chitin-containing speaker diaphragm is conventionally manufactured through a
process of mixing powdery or flaky chitin with a pulp slurry and forming it (for example, JP-A63-38399, JP-A-63-43496, JP-A-6: 3-245099, JP-A-63-246098, JP-A-63-287298, etc.).
[Problems to be Solved by the Invention] However, in the conventional speaker diaphragm
containing the above-mentioned chitin, the chitin is not in the form of fibers, so that the
dispersion with the valve fiber is not uniform, and the pulp speaker There is a problem that
sufficient strength can not be obtained because no bond is formed. In addition, in order to
improve the strength, a special resin as a binder is required, which causes a problem such as the
manufacturing process becoming extremely complicated. The present invention has been made
in view of the above problems, and an object thereof is to provide a speaker diaphragm which
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can impart excellent physical properties in the fabrication of a speaker diaphragm containing
chitin and which can be fabricated more simply. It is to provide a manufacturing method of
[Means for Solving the Problems] Therefore, according to the method for manufacturing a
speaker diaphragm of claim 1 of the present invention, after producing a non-woven fabric 77
containing chitin fibers, a cavity corresponding to a predetermined diaphragm shape. Heat press
forming the non-woven fabric mat and the bonding material in a mold having a mold to cause a
phase change from the liquid phase to the solid phase in the bonding material and causing the
bonding material and the non-woven fabric mat to form the cavity It is characterized in that it is
formed in a shape in accordance with.
In the method of manufacturing a speaker diaphragm according to claim 2, in the manufacturing
method according to claim 1, the binder is made of a thermosetting resin, and a solution of the
thermosetting resin is used as the non-woven mat. After impregnation, the non-woven mat is
heat-pressed to form. Further, in the method of manufacturing a speaker diaphragm according to
claim 3, in the manufacturing method according to claim 1, the binder is made of a thermoplastic
resin film, and the thermoplastic resin film and the non-woven mat are laminated. And heat press
molding. Further, in the method of manufacturing a speaker diaphragm according to claim 4,
after preparing a non-woven fabric mat by mixing chitin fibers and a binder made of
thermoplastic resin fibers, a cavity corresponding to a predetermined diaphragm shape is
obtained. It is characterized in that the non-woven fabric mat is formed into a shape along the
cavity by causing the melting of the above-mentioned bonding material to occur once by heatpressing the non-woven fabric mat with a mold having the same. In the method of manufacturing
a speaker diaphragm according to claim 5, in the manufacturing method according to claim 1, 2,
3 or 4, use of a hollow fiber as the chitin fiber It is a feature. [Operation] According to the method
of manufacturing a speaker diaphragm of the first aspect, first, a non-woven mat containing
chitin fibers is formed by a wet or dry method. Then, for example, a bonding material made of a
thermosetting resin as in the method of manufacturing a speaker diaphragm according to claim 2
or a thermoplastic resin film as a method of manufacturing a speaker diaphragm according to
claim 3 With the bonding material and the like, the non-woven mat is heat-pressed in a mold. By
this heat press molding, for example, when the binder is made of the above-mentioned
thermosetting resin, the temperature is raised to the curing temperature in the mold and cured,
and as a result, the non-woven fabric mat has a predetermined diaphragm shape. While being
shaped, chitin fibers are in a state of being firmly bonded to each other via a thermosetting resin.
When the binder is made of the above-mentioned thermoplastic resin film, the thermoplastic
resin film is once melted at the time of heat press molding and then solidified in the process of
lowering the temperature to room temperature after press molding in the same manner as above.
The nonwoven fabric mat is shaped into a predetermined diaphragm shape, and chitin fibers are
firmly bonded to each other through the thermoplastic resin. Thus, a non-woven mat is prepared
by incorporating chitin fibers in advance, and this non-woven mat is heat-pressed with a binder
that produces a state change from liquid phase to solid phase in response to temperature change.
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Therefore, the chitin fibers are firmly bonded to each other through the bonding material
solidified after entering the chitin fibers in the liquid phase, and thus the chitin-containing
vibrating plate having an improved mechanical strength is special as in the conventional case. It
can be easily produced without the need for a resin or the like.
According to the method of manufacturing a speaker diaphragm of claim 4, a thermoplastic resin
fiber as a binder and a chitin fiber are mixed to form a non-woven mat, and the non-woven mat is
heat-pressed and formed. Also, substantially as described above, the thermoplastic resin fibers
are once melted at the time of hot press molding and then solidified, whereby the nonwoven
fabric mat is shaped into a predetermined diaphragm shape and chitin via the thermoplastic
resin. It is possible to produce a speaker diaphragm in which the fibers are firmly connected to
each other. On the other hand, in the case of manufacturing using a hollow chitin fiber as in the
method of manufacturing a speaker diaphragm according to claim 5, the apparent density is
reduced, and therefore, the weight can be further reduced. Further, in the case where the weight
as the sliding force vibrating plate is made equal to that of the conventional one, as a result that
the thickness can be made thicker results in having a larger bending rigidity, it is further
excellent that split resonance hardly occurs It can be manufactured as a speaker diaphragm
having acoustic characteristics. [Example 1] After demineralizing the cocoon of salmon with
dilute acid and deproteinizing with dilute alkali to obtain chitin, chitosan obtained by further
treating this chitin with concentrated alkali is dissolved with formic acid Do. The chitosan
solution was extruded and coagulated from a spinneret to obtain chitosan fibers, and then the
chitosan fibers were acetylated to produce 2-denier chitin fibers. A non-woven mat of about 8
mm in thickness and a basis weight of 90 g / rrr is formed from this chitin fiber by a punch
needle method, and further, this non-woven mat is impregnated with a phenol resin to a dry
weight ratio of 15% and air-dried. Hot press molding was performed to produce a cone-shaped
speaker diaphragm having a diameter of 12 cm and a thickness of 0.4 mm. The above-mentioned
chitin fiber has a higher elongation than, for example, other high modulus fibers such as carbon
fiber, glass fiber, or silicon carbide fiber, so that non-woven mats mainly composed of chitin fiber
have good embossing property. It is. As a result of being excellent in molding processability as
above, for example, molding as a deep cone-shaped speaker diaphragm is also possible. Then, the
heat at the time of hot press molding in the above-mentioned manufacturing process cures the
phenol resin which is a thermosetting resin, and thereby, it is shaped into a shape as a speaker
diaphragm. Physical properties of the speaker diaphragm of this example are shown in Table 1.
The speaker diaphragm is easy to form as described above, is light in weight, and has high
flexural rigidity and is not easily deformed, and therefore does not cause split resonance and has
a large internal loss. It has the characteristics.
Example 2 The nonwoven fabric mat obtained in Example 1 and a nylon film having a thickness
of 0.030 mm (made by Daicel Chemical Industries, Ltd., trade name: Diamide film) are laminated
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and heat-pressed to a diameter of 12 cm. A cone-shaped speaker diaphragm having a thickness
of 0.degree. 4 mm was produced. In this embodiment, the nylon film, which is a thermoplastic
resin, is melted by heat at the time of pressing, and is solidified in the subsequent cooling
process, thereby bonding the fibers and forming the shape as a speaker diaphragm. Be done.
Physical properties of the speaker diaphragm of this example are shown in Table 1. [Example 3]
Non-woven mat of about 8 mm in thickness and 85 g / rrf in thickness is mixed by 2-needle
polypropylene fiber at a weight ratio of 10% with 2-denier chitin fiber obtained in Example 1 by
a punch needle method. Formed. The non-woven mat was heat-pressed to produce a cone-shaped
speaker diaphragm having a diameter of 12 cm and a thickness of 0.4 mm. In this embodiment,
polypropylene fiber which is a thermoplastic resin is melted by heat at the time of pressing and
solidified by cooling, whereby bonding between chitin fibers is made and shaped into a
diaphragm shape. Physical properties of the speaker diaphragm of this example are shown in
Table 1. Example 4 Two denier polypropylene fiber and carbon fiber were mixed in a ratio of
70%, 10%, and 20% to the 2 denier chitin fibers obtained according to Example 1 according to
the punch needle method. A non-woven mat having a thickness of about 8 mm and a basis
weight of 100 g / rd was formed. The non-woven mat was heat-pressed to produce a coneshaped speaker diaphragm having a diameter of 12 cm and a thickness of 0.4 mm. Physical
properties of the speaker diaphragm of this example are shown in Table 1. EXAMPLE 5 The
chitosan solution obtained in the same manner as in Example 5 is extruded and coagulated using
double-tube spinro gold to obtain hollow chitosan fibers, which are then acetylated to give 4
deniers. Hollow chitin fibers were produced. This fiber is mixed with 2 denier boropropylene
fibers to form a non-woven mat having a thickness of about 10 mm and a basis weight of 90 g /%
according to the Bantinii dollar method, and this non-woven mat is heat-pressed to a diameter of
12 cm, A cone-shaped speaker diaphragm having a thickness of 0.6 mm was produced. In the
present embodiment, the hollow density of the chitin fibers reduces the apparent density, and
hence the weight can be further reduced. When the speaker diaphragm is made to have the same
weight and thickness, the bending rigidity can be increased.
Physical properties of the speaker diaphragm of this example are shown in Table 1. Comparative
Example As a comparative example, the physical properties of a cone type speaker diaphragm
manufactured by forming a kraft wood pulp by paper forming are shown together in Table 1. The
present invention is not limited to the above examples. For example, suitable materials other than
the resin materials mentioned in the above examples can be selected and used as the binder. In
addition, it is also possible to adopt another heat pressing method, such as pressure injection of a
liquid resin material into the molding die and solidification after loading a non-woven mat
containing chitin fibers into the molding die, It is possible in the range of the manufacturing
method of the speaker diaphragm of item 1. Furthermore, although the case where a cone-type
speaker diaphragm was produced was mentioned as an example in the above, the speaker
diaphragm of another shape can also be produced by applying this invention. [Effects of the
Invention] As described above, according to the method of manufacturing the speaker diaphragm
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of the present invention, the nonwoven mat containing chitin fibers and the binder, or the
nonwoven mat containing resin fibers and chitin fibers as the binder are used. And hot press
molding to produce a chisel-containing loudspeaker diaphragm. In this case, in addition to the
intertwining state of the chitin fibers, the bonding state is further strengthened by the bonding
material solidified after having infiltrated between the chitin fibers in the liquid phase state, and
at the same time, it is formed into a predetermined speaker diaphragm shape . Therefore, a
loudspeaker diaphragm with improved mechanical strength can be manufactured more simply
without passing through a special binder or a complicated manufacturing process. Furthermore,
by using a hollow chitin fiber, it can be manufactured as a lighter-weight speaker diaphragm or a
speaker diaphragm with higher strength. As described above, it is possible to easily manufacture
an excellent speaker diaphragm having good physical characteristics of light weight, high
rigidity, high elasticity, and high internal loss, and thereby having excellent distortion and low
high-resonance frequency. The effect of being able to
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