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TECHNICAL FIELD The present invention relates to a speaker diaphragm made of a doublelayered fiber vc, in which a heat-meltable resin is entirely coated on a surface of a single fiber of
organic fiber or organic fiber, and a method of manufacturing the same. In the past, as a
pregnant two-speaker vaginal delivery material, a large amount of soot has been used. This is
because light is light and has appropriate rigidity and internal loss τ, but the valve itself has a
relatively small Young's modulus, so that the physical properties VC of the diaphragm are limited
* o from this Various methods have been tried to improve the physical properties of the
transmission plate. One of them is a method of forming a sheet by mixing various elastic fibers of
valve VC, or a single plate of a light metal such as aluminum, titanium, Ba IJ IJ, or its steaming. A
method of using a coated material, a father, or the like is to use a honeycomb or other structure.
However, in the former case, the diaphragm which is L has high elasticity fiber @ f? Even when
mixed as a cocoon in a pile, the high elastic fiber itself 1c7 J) is not good in the same as the
Young's modulus because of poor cohesion and the fiber unevenness of each part of the
diaphragm is also large. -In the case of the diaphragm by the latter, the Young's modulus is large
but the internal loss is small, and is it special processing? Kaname-"It's a cost, so it's a cost." As
mentioned above, is it a fault? As a solution to this problem, various developments have recently
been made on speaker diaphragms which are made of high elastic fiber-on-fiber synthetic resin.
As an example thereof, there are JP-A-54-53523 force, and JP-A-54-66119, and the like. A fiber,
the synthetic pulse purple mixed paper heated heating plate, and a method for producing the
same have been proposed. Is such a speaker diaphragm in the same paper-making process as a
conventional valve diaphragm? Although it was possible to use it and the same Young's modulus
as above was counted, it was still a poor component as a speaker diaphragm. That is, 1) The
synthetic valve has poor dispersibility with water. It is difficult to mix the high elastic fiber and
the synthetic valve uniformly. Accordingly, since one synthetic valve is not uniformly
interspersed among all the high elastic fibers, it is impossible to obtain a perfect bonding state
between the high elastic fibers, and the same applies to the large diameter and the blowout rate
of the speaker diaphragm. ? In a dispersion of high elasticity fibers dispersed in a dispersion of
high elasticity fibers, a water-soluble binder such as HEOH IJ vinyl alcohol or an emulsion of
synthetic g 4ff + fat is mixed to form a sheet, and it is simultaneously heated and dried. There is a
speaker diaphragm that is made to bind, but is there enough light coupling? In order to obtain
the solution, a large amount of binding agent must be mixed in the dispersion, and if binding
agent is wasted, excess binding will occur at a location that does not contribute to bonding
between the scissors, cutting blade, and high elastic fiber. Adhesives were deposited, leading to
the disadvantage of increased weight.
The present invention has been made in view of such islands, and the surface of a fibrous
material having high elasticity is a double-layered fiber coated with a heat-meltable resin, and
this resin is heat-melted. A speaker diaphragm in which the fibers are coupled, and a method of
manufacturing the same. J 2 構造 繊 維 Ω Ω Ω Ω Ω Ω Ω Ω 無 M M M M fiber 1 such as
carbon fiber, glass fiber 2 boron fiber, alumina fiber, seven other metal fibers, etc. or 8! Fine
fibers such as polyester fiber, polypropylene fiber, acrylic fiber, aromatic polyamide fiber, rayon
fiber, vinylon * m, surface of fibrous material having elasticity such as polyamide fiber VC,
heating and softening bath 1G! The resin 1 is coated with, for example, a large amount of heat i:
II plastic resin and a part of a thermosetting resin. Next, a method of manufacturing a diaphragm
for a speaker using such a 2M structure fiber will be described first. First, after the fiber to be the
core material is obtained by melt spinning, calcining carbonization, or VC processing such as
crystallization, Here? In the state of single fiber, said resin should be coated with vc'fl in the resin
solution to be coated? A single fiber surface V is coated and attached to the periphery. It should
be immersed (iJ fat liquid, dissolved in resin r solvent, one resin, or the resin is heat-melted to use
1 liquid or the like). As the other coating method, the spraying method is used, and the concern
coating method is used for the carbon fiber-beating 4-fiber VC. なお。 In order to strengthen the
adhesion at the interface between the fiber and the resin and to obtain uniform adhesion C, lth
always, In advance, the fiber VC is subjected to an appropriate surface treatment τ. As a surface
treatment agent to be used for this purpose, there is conventionally used a silane-based
toughening agent which is conventionally used in the production of a complex of an inorganic
agent and a 'ffm agent. Cut to about 5 t of structural fiber, this? In the light furnace or the mold,
the sheet is heated to a temperature above the melting point of the surface resin of the fibers.
According to this, a speaker diaphragm is obtained in which the molten resin is bonded to each
fiber at all contact points between the fibers. 0 Further, the surface resin of the fiber is a film
inside the diaphragm. It is a VC that forms into a shape, and a kneading effect is given by
kneading. The speaker diaphragm of the present invention is formed of a double-structured fiber
coated with a heat-sealable resin r on the peripheral surface of a single fiber of an inorganic fiber
or an organic fiber having high elasticity. Depending on the melted resin, the inorganic or
organic fiber?
As it is bonded, it is possible to reliably bond the fibers evenly in all the contact portions of the
inorganic or organic fiber, and it is possible to make the physical property values uniform and
the Young's modulus large. Since there is no need for a large amount of resin to adhere to the
portions other than the contact points between 0 and the fibers, which can be measured by the
same method as described above, it is possible to suppress a single weight increase. Furthermore,
if a suitable internal loss can be obtained by such a resin, the method for producing a diaphragm
for a speaker according to the present invention may be 1Q or may be applied with a sealing
effect. Resin which can be heat-melted to inorganic fiber or organic fiber having high elasticity?
The coated double structure fiber is made into a whole sheet and heated in the furnace or in a
mold above the melting point of the resin. Depending on the melted resin, the inorganic fiber or
the organic fiber? Because they are combined, new additives such as binders in the abovementioned paper making process? Dispersion papermaking can be easily carried out without
using it, and in the production of the double structure fiber, the ratio between the electric charge
of the resin and the inorganic or organic fiber? It is possible to set, so waste of resin material as
binder? It can be eliminated. Hereinafter, specific examples of the speaker diaphragm according
to the present invention? Describe. [Example 1] Continuous long fibers of glass fiber collected
and wound by direct melt method vC? Is it one that is washed with water and a focusing agent?
Remove 1 and then immerse in 1% aqueous solution of γ-aminopropyltritoxysilane 1 then forcedry the silane treatment agent? Adhere to the glass fiber surface. Then this? Then, in a liquid of
polyethylene that is in a hot-melted state (140'C), impregnate with IC in the liquid phase, and let
it solidify by cooling in 9 phrases, then roll up at a constant speed. Glass fiber thus woundpolyethylene d! 2. cut into short fibers of about 54 m long double structure fiber 1 At this time,
the diameter of glass fiber is 10μ, polyethylene? The diameter of the double-structured fiber in
the coated state is 18μ, and the polyethylene is covered in a cylindrical shape around glass fiber
with a thickness of 4μ. Polyethylene-coated short glass fibers obtained by boiling? After being
dispersed in Eri water in the usual way and sheet-formed with a cone-shaped metal mesh, it is
press-formed in a mold heated to 140 'C and a diaphragm? obtain. In this diaphragm, glass fibers
are uniformly dispersed. Glass fiber? Is the covering polyethylene completely melted at the
junction of fibers? It covers and bonds, and at the same time forms a thin film between fibers to
produce a filling effect. The physical property value measured by the flash-reading method of
fragments of such a moving plate is the end of a rose. Elastic modulus K = 390 Ky / 藺 2 density
−1-1, 44 f // CIIL3 internal loss tan δ = 0.072 [Example 2] Firing carbonized and wound pitchbased carbon fiber (Young's modulus 15 ton β m 2 long fiber Total nitric acid 60% aqueous
solution, potassium permanganate 40% aqueous solution and sodium hypochlorite solution)
Immersion treatment in aqueous solution of 40% aqueous solution of IJium?
And adhesion to resin? After modification and immersion in a hot melt (150'O) of mixed
polyamide (nylon 6-10e 60%, nylon 6vi-20, nylon 6-6 20%) at a constant speed, it is pulled and
cooled Take up. In this way, the double-structured fiber comprising carbon fiber and nylon fiber
is cut into short fibers of about 5 lengths. At this time, the diameter of carbon fiber is 12μ,
mixed nylon? The diameter of the dual structure fiber in the coated state is 22μ. Nylon-coated
carbon fiber thus obtained? After being dispersed in water and made into a sheet by wire mesh, it
is press-formed in a 180 'CVC heated mold to obtain a diaphragm. In such an imaging plate,
nylon melts and becomes interfiber at each contact part of double structure fiber? The covering
properties were as follows: 0 elastic modulus K = 770xf / 關 2 density ”′ ′ ′ ′ ′ ′ 0.551 /
l * internal loss tan δ = 0.041 [Example 6] fiber diameter 11.9 μm, degree m 1.45 f / so,
winding long fiber r of aromatic polyamide fiber (Du POnt p Kevlar-49 Aramid) with Young's
modulus 134 [J OK f / M] after degreasing 7c, mixed polyamide (nylon 6-10 to 60 %, Nylon 6 r
20%, nylon 6-6i 20%) in a hot melt (150 ′ ′ O) at a constant VC speed, then pulled up, cooled
and taken up. Aromatic polyamide fiber wound and wound-double structured fiber consisting of
nylon? Short fiber of about 6 lengths long 切断 cut 0 At this time, the diameter of the double
structure fiber in the state coated with the mixed nylon is 20μ, and after forming into a short
fiber r in the same manner as in the previous example, 170 ′ ′ It press-molds in the metal
mold heated to C, and obtains the diaphragm r. In such a diaphragm, at each contact portion of
the 21 structural fibers, nylon melts, handles between fibers and bonds, and nylon becomes a
thin film r forming between the skeletons of aromatic polyamide fibers. The physical properties
of this diaphragm were as follows. Elastic modulus E = 788 Kl / M2 density −-0, 51 f / l *
'internal loss tan δ = 0.036552
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