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Description 1, title of the invention
Method of manufacturing diaphragm for speaker
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a low density speaker peristaltic plate mixed with foam-containing fine particles.
As the physical characteristics of the speaker diaphragm, its blade operation4. It is desirable to
do the piston movement as much as possible from the viewpoint of the stability of operation and
the frequency characteristics as well as theoretical analysis, and it is desirable that the
mechanical internal loss is large and suitable for lii'IQ. In addition, it is necessary to be
lightweight in terms of the acoustic radiation efficiency of the speaker, and a rigid, large, and
low-density diaphragm is required. In the past, in order to obtain such a low density diaphragm,
it was made by using fibers with a low degree of freeness, but the diaphragm using such fibers is
weakly vibrating due to the bonding between the fibers. It can not satisfy the rigidity required for
the plate. On the contrary, if you use a fiber with a high degree of freeness, it will be stiffer or
worse and its density will increase, and the weight of the diaphragm will be contracted. As one of
means for solving such contradictory phenomena, there is a vibrating plate in which the density
is reduced by mixing foam-containing fine particles, and it is known as the following method 71
as a method of producing it. (1) Mix unfoamed fine particles into fibers, and water-bathable poly.
A method in which a sizing agent such as an amide resin or a synthetic resin acid colloid is added
to fix the fine particles on the fiber, and after forming the sheet, heat and pressure are applied in
a mold to foam at the same time as forming. EndPage: 1 (2) Foamed fine particles containing
foam are mixed into fibers, and sizing agents such as synthetic rubber emulsions and synthetic
resin acid colloids are added to fix the foamable fine particles on the fibers, making hot pressing
after paper making how to. However, in the above method (1), there is no means for strongly
bonding the fibers and the unfoamed fine particles, so most unfoamed fine particles flow out into
the drainage during paper making, and the loss of unfoamed fine particles is large It is
economically disadvantageous, and in the method of (2), it is easy to float the pre-foamed foamcontaining fine particles or to separate them from the fibers, and use it-(a large amount of
synthetic rubber such as emulsion rubber etc. Then, there is a drawback that the amount of
weight reduction by the foam-containing fine particles is offset by an increase in the amount of fi:
@ In addition, it is thought that there are two actions in one movement of the bubble-containing
one raw machine particle or the lower part of the vibrating plate, one of which is simply due to
the name space corresponding to the volume of the bubble-containing character itself. Is an
action to create new voids between fibers outside the space excluding n-containing fine particles
or preventing the dense deposition of fibers interposed between the fibers. From this point of
view, according to the method of (1), after the paper making and foaming method, a dense paper
layer is once formed by paper making and then expanded by foaming, so that the volume of
foamable fine particles expanded by foaming is increased. Only the corresponding portion
excludes the fibers, and the action of forming voids between the fibers other than the space due
to the foamable fine particles can not be expected.
When the volume of the fine particles is small relative to the space naturally formed in the paper
layer at the time of paper making, the fine particles introduced into the empty space are merely
filled with the space to reduce the density of the diaphragm. All (not involved. Furthermore, even
if fine particles are intervened between fibers, if the voids generated during papermaking are
adjacent or adjacent to each other, the fibers will be pushed up by volume addition during
foaming to create voids with less resistance than voids created between fibers. And it can not
contribute to the reduction of density. Since the structure of the Y diaphragm is determined
during the process of depositing most of it on a fiber or a net, it is possible to make the foamcontaining fine particles work effectively at the time of papermaking. It becomes a problem in
making of. The present invention is a manufacturing method in which this point is improved, in
which minute hollow spheres are effectively made to act to lower the density of the diaphragm,
and fixation of the fine particles to the fibers is promoted to minimize loss of the material. To
explain the present invention in more detail, the unfoamed fine particles of giniriten acryronitrile
micro hollow spheres are mixed into the fiber into the highly beaten (C9F200-300QQ) cellulose
fiber or the mixed fiber with non-cellulose fiber, A polymer flocculant such as polyethylene imine
or polyacrylamide is mixed to make the non-foamed fine particles into fibers, and then heated to
foam the non-foamed fine particles to form micro hollow spheres between the fibers. Next, the
fiber layer deposited in the papermaking and netting is dried or, if necessary, lightly pressed and
shaped. The fixing mechanism of fine particles to fibers according to the method of the present
invention is as follows. That is, the highly beaten, fully fibrillated fibers, or fine particles located
between fine fibers, adhere to be encased among the fibers when the fibers aggregate due to the
action of the coagulant. Therefore, the bond between the fine particle and the fiber is extremely
large, and it does not drop off in the valley by a slight external force, and the fiber and the fine
particle both have a negative surface charge, so a cationic coagulant is used as a coagulant. It can
be attached more strongly by the addition of attractive force. After the fine particles are fixed in
this way, they are heated and foamed to form micro hollow spheres, and then papermaking is
carried out. → ヰ ζ ヰ 時 に 時 に 微小 微小 微小 微小 微小 '' 7 '(j3' i% deposited layer In
addition to the space where micro hollow spheres exist between the fibers and between the
fibers, it is also effective in forming other air gaps between the fibers in addition to the space
where the hollow micro spheres expand. It is. Next, an embodiment of the present invention will
be described. 10 wt% of poly (vinylidene chloride) acrylonitrile micro hollow spheres are mixed
with unfoamed fine particles of 10% by weight of poly (nylidene acrylonitrile) micro hollow
spheres and further 2-3 weight EndPage: 2 % Of polyethylene imine is added to coagulate the
fibers and fix the microparticles.
The mixture is heated to 80 ° to 90 ° C. to foam fine particles, and then made into paper and
dried. Table 1 shows the physical properties of the diaphragm obtained using only the
diaphragm and NBKP thus obtained. As apparent from the table, in the diaphragm according to
the present invention method, the density in the first table is significantly reduced while Young's
modulus (E) is almost changed, E / 119 is increased, and internal loss (tan δ) is also slightly I
understand that it will increase. As described above, according to the manufacturing method of
the present invention, not only the space for eliminating the foam-containing particles but also
the other voids can be formed between the fibers by the foam-containing fine particles
interposed between the fibers. The effect of lowering the density can be fully exhibited, and the
fixing action of the fine particles on the fiber utilizes the aggregation action and electrostatic
action of the fiber, so the flocculant may be a livelihood, and the fixing by the rubber emulsion
Since it is not assumed that the resin itself is deposited, the method according to the present
invention is more than having no factor at all when offsetting the advantages of the low
temperature diaphragm such as weight increase due to adhesion of the fixing agent. According to
the manufacturing method, it is possible to provide a low density, rigid large, large internal loss
diaphragm with a loss of material or a small amount It is a thing. EndPage: 3
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