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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm used for various acoustic devices. In the prior art, generally, as the speaker
diaphragm, one obtained by paper-forming natural rope (rup fiber) has been used. Also, in order
to improve the rigidity, materials obtained by uniformly mixing and forming high elasticity fibers
such as carbon fibers and alumina fibers with natural pulp fibers are used. The material is
aluminum titanium beryllium. Metals such as boron and polymer materials such as
polypropylene, polyarylate, polyethylene and the like have been used extensively. Problems to be
Solved by the Invention With 100% natural pulp fiber, surface rigidity is weak and high band
limit regeneration zone is low, material cost is very expensive with metal material, deep drawing
is difficult, and polymer material Is poor in heat resistance and adhesion. Also, from the
viewpoint of material, cost and formability, a diaphragm obtained by adding a reinforcing
material to natural pulp fiber and mixing it is the most suitable, but to improve the physical
properties of the natural pulp fiber itself, and a reinforcing material It was difficult to obtain a
binder suitable for the above, and the rigidity as the diaphragm was not sufficient. The present
invention is intended to provide a speaker diaphragm which can solve such problems. Means for
Solving the Problems In order to solve the above problems, the present invention mixes 5 to 20
wt (%) of a surfactant-treated reinforcing material with natural pulp fibers in a beater. While
sufficiently stirring, an anionic polyacrylamide resin and a cationic polyamide epichlorohydrin
resin as binders are each used as a binder for 0.6 to 2 wt. After the addition of O wt (%), the
neutral sizing agent is 0.5 to 1. It is a speaker diaphragm made by adding owt (%) and mixing and
forming. The surface-treated reinforcing material is mixed to strengthen the bonding strength
with natural pulp fiber, and after fixing the anionic polyacrylamide resin of paper strength agent
with aluminum sulfate, the anion is still in excess. The cationic polyamide epichlorohydrin resin
is fixed to the part. And finally add the neutral size. Therefore, the former polyacrylamide resin
acts as a binder to enhance the paper strength, and the latter polyamide epichlorohydrin resin is
fixed around natural pulp fibers and thermally cured when heated to improve rigidity and
dimensional stability. The diaphragm obtained by mixing and forming the above additives with
natural pulp has moderate internal loss and overall strength of 5 minutes in average, and reduces
the distortion characteristics of the speaker, and It is intended to extend the band limit
reproduction frequency band to obtain desirable characteristics.
EXAMPLE Hereinafter, a speaker diaphragm in an example of the present invention will be
described. As shown in Table 1, the carbon fiber to which the silane coupling agent has been
applied is 10 wt% relative to the natural pulp fiber which has been made to have a freeness of
20'sR in advance by a beater, and is sufficiently stirred in the beater. . Next, as shown in FIG. 1, 1
and s (wt%) of anionic polyacrylamide resin 1 are added to natural pulp fibers, and after
sufficient stirring, pH 4,0 to PH 5,0 with aluminum sulfate 2 Adjust to fix on cellulose 3. Next,
after anionic polyacrylamide resin 1 is fixed, cationic polyamide epichlorohydrin resin 441 (wt%)
is added to the natural pulp fiber, and at this time, cationic polyacrylamide resin 1 is still in
excess. It settles in a certain anion part. In addition, the cationic polyamide epichlorohydrin resin
4 is adsorbed to the anion portion of the polyacrylamide resin 1 which is fixed and fixed in the
form of unfixed polyacrylamide resin 1 and polyamide epichlorohydrin resin 4 ion complex. .
Finally, in order to improve water resistance and moisture resistance, a neutral sizing agent is
added to natural pulp fibers at 1.0 (wt%). The speaker diaphragm of the present invention is
obtained by papermaking, m heat, 7 Jl pressure, and 710 processing of the material obtained
above from the shape of the diaphragm. The physical properties of the FA711] carbon fiber and
each resin are shown in (Table 2). A comparison of the physical property values of the diaphragm
of the present invention and the conventional diaphragm is shown in (Table 3). Conventional
products are mixed with IQ (wt%) of carbon fiber of (Table 1) to pulp, latex (SBR) i 3 (wt%) to
binder, 1 wt% of rosin size added to pulp . Adjust to pH 4,0 to 6,0 with aluminum sulfate to it.
(Table 3) FIG. 2 shows frequency characteristics of a speaker using the diaphragm of the present
invention and the conventional product. It is flatter than conventional products, and has high
voltage frequency characteristics with higher upper limit frequency. As described above, since
the diaphragm of the present invention is configured, the diaphragm having high physical
property values required for the speaker diaphragm can be easily manufactured using
conventional equipment, and it is possible to use the high frequency band higher limit frequency.
It is a great industrial value that can provide high flat sound pressure frequency characteristics.
Brief description of the drawings
FIG. 1 is a view showing fixing of the resin of the present invention, and FIG. 2 is a sound
pressure frequency characteristic diagram of a speaker using a conventional diaphragm and one
diaphragm of the present invention.
1 ...... polyacrylamide resin, 2 ...... aluminum sulfate, 3 ...... cellulose, 4 ...... cationic polyamide
epichlorohydrin resin.