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JP2004194210

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Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2004194210
The present invention provides a method for manufacturing a papermaking diaphragm in which
the direction of orientation of the fiber material can be made extremely easily radial and easy to
manufacture, an apparatus therefor, and a papermaking diaphragm manufactured thereby.
SOLUTION: The upper part of a cone-shaped papermaking net 4 placed in a papermaking tank 6
in which a slurry of fiber material is put, the central part 4a from the central part 4a side of the
papermaking net 4 or the peripheral part side The flow of water toward the side causes the fiber
material to be radially squeezed along the flow. The flow of the slurry of the fiber material is
made by providing the mask plate 7 having the slurry introduction holes 7a and 7d of the fiber
material on the outside of the papermaking network 4 and reducing the pressure of the paper
network support 1 with the papermaking network 4 set. Be This pressure reduction is performed
by a vacuum adjustment control valve 3 and a vacuum pump 2 which are provided below the
papermaking web support 1. [Selected figure] Figure 1
Manufacturing method of papermaking diaphragm, manufacturing apparatus of papermaking
diaphragm and papermaking diaphragm
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a papermaking diaphragm used in an acoustic device, a manufacturing
apparatus, and a papermaking diaphragm manufactured thereby. The physical properties
required for a diaphragm for an electroacoustic transducer such as a speaker are as follows:
specific elastic modulus, specific flexural rigidity, large appropriate internal loss, resistance to
mechanical fatigue, weather resistance Sex is good. As the diaphragm material, there are various
metals, ceramics, synthetic fibers, carbon, aramid fibers, synthetic resins, papers mainly made of
paper, and the like. Among them, paper diaphragms are generally used widely because they have
advantages such as low mass, high freedom of design, and advantageous in cost. ing.
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Conventionally, as shown in FIG. 7, for example, as shown in FIG. 7, this paper-made diaphragm
is made on a paper-making net support portion 1 provided with a control valve 3 for vacuum
drawing connected to a vacuum pump 2 at the lower part. Set the net 4 and set up the
papermaking tank 6 above it, supply the slurry 5 of the fiber material from the raw material tank
8 into the papermaking tank 6, adsorb the slurry 5 of this fiber material on the top of the paper
mesh 4 It is stacked, made into paper and manufactured through a drying process. The
papermaking diaphragm manufactured in this manner can not be said to be sufficiently strong,
and it is difficult to obtain a good sound quality. As described above, since the specific elastic
modulus and the specific flexural rigidity are not sufficient for the diaphragm of papermaking,
various methods have been conventionally attempted in order to improve the strength. As its
precedents, for example, it is intended to impregnate a resin after paper making and drying as in
JP-A-57-23388 to obtain a desired strength, carbon fibers, aramid fibers, etc. as paper-making
materials as disclosed in JP-A-63-224587. There are some which tried to obtain desired strength
by mixing and forming high elastic fibers of However, in the method of impregnating a resin, if it
is intended to obtain a sufficient effect, the amount of resin input increases, the weight of the
diaphragm becomes heavy, and the work process becomes complicated, leading to a high
number of man-hours. It was Moreover, the method of mixing and making high elastic fibers
such as carbon fibers and aramid fibers is expensive, and there is little or no bonding strength
between the fibers, so if a large amount of binder such as resin is not used In addition, the weight
was heavy and the cost was increasing. Japanese Utility Model Laid-Open Publication No. 57180799 is a prior example in which the strength of the paper diaphragm itself is increased.
This prior example relates to an apparatus for manufacturing a diaphragm made of paper by
supplying a slurry of fiber material to a rotatably configured papermaking net. That is, this
apparatus rotatably supports a papermaking net, and makes the papermaking net face a nozzle
for supplying a slurry of fiber material. This nozzle consists of a collection of a large number of
small diameter pipes, and is arranged substantially orthogonal to the radial direction of the
papermaking mesh. Then, when the slurry of the fiber material is supplied to the rotating
papermaking net through the nozzle, the slurry of the fiber material is supplied in the
circumferential direction, so the orientation direction of the pulp fibers is also arranged in the
circumferential direction. Therefore, a paper diaphragm having high rigidity in the
circumferential direction is obtained. However, in this apparatus, the diameter and the length of
the nozzle for slurry supply of the fiber material are respectively 0.5 to 1.0 times the average
fiber length of the pulp fiber. And 10 to 20 times, they are integrally formed in parallel, and the
papermaking mesh is also rotatably supported, and there is a problem that the entire
configuration is complicated. In addition, when the supply of the slurry of fiber material is
stopped, the slurry of the fiber material may be supplied over the already supplied slurry of fiber
material, and in this case, the fiber material is clumped in that part. There is also a problem that
this causes distortion sound generation and good sound quality can not be obtained. Further, in
this prior example, the orientation of the pulp fibers is in the circumferential direction to increase
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the rigidity in the circumferential direction, but a voice coil is coupled to the center of the
diaphragm, and the vibration of this voice coil is from the center to the outer periphery It is
desirable to increase the radial stiffness in order to propagate radially towards the part. The
present invention has been proposed in view of the above, and the object of the present invention
is to provide a method of manufacturing a papermaking diaphragm in which the direction of
orientation of the fiber material can be made extremely easily radial and which is easy to
manufacture An apparatus, which is to provide a papermaking diaphragm manufactured thereby.
According to the present invention, according to the present invention, on the upper part of a
cone-like papermaking net 4 placed in a papermaking tank 6, the peripheral part side or the
peripheral part from the central part 4a side of this papermaking net 4. The above object is
achieved by manufacturing a diaphragm by radially pulsing the fiber material along the flow
from the side toward the central portion 4a side. As a fiber material in this case, one or two or
more kinds are selected from pulp fibers, synthetic fibers, and inorganic fibers, and papermaking
is performed.
The water flow direction is disposed above the papermaking mesh 4 and is formed by the mask
plate 7 into which the slurry of the fiber material can be introduced. In this case, a slurry of a
fiber material is introduced into the upper portion of the mask plate 7 at a position
corresponding to the central portion 4 a of the papermaking mesh 4, and water flow from the
central portion 4 a to the peripheral portion of the papermaking mesh 4 The slurry introduction
hole 7a of the fiber material which makes up is formed. Alternatively, the lower side of the mask
plate 7 is formed with a slurry introduction hole 7 d of a fiber material that creates a water flow
from the peripheral portion of the paper mesh 4 toward the central portion 4 a. The apparatus of
the present invention used in the above manufacturing method is hollow in which the inside can
be depressurized and a cone-shaped papermaking net 4 is provided at the upper part, and the
slurry of the fiber material in the paper making tank 6, 6A is made up. And a concave portion 7b
provided on the outer side of the paper mesh 4 and having an inner surface substantially the
same shape as the paper mesh 4, and the inner surface has a predetermined distance from the
paper mesh 4 The mask plate 7 is disposed on the upper central portion or the lower side surface
of the mask plate 7, and the water flow from the central portion 4a side of the papermaking
mesh 4 toward the peripheral portion side or from the peripheral portion to the central portion
4a side It is set as the structure which formed the slurry introduction holes 7a and 7d of the fiber
material which produces. Then, a papermaking diaphragm is manufactured by the above method
and apparatus. Embodiments of the present invention will be described below with reference to
the drawings. Embodiment 1 FIG. 1 is a schematic longitudinal sectional view of a device for
manufacturing a papermaking diaphragm according to a first embodiment of the present
invention. In the figure, reference numeral 1 denotes a papermaking support, the inside is
hollow, and the lower part is connected to a vacuum adjustment valve 3 connected to a vacuum
pump 2 and is configured to be able to reduce pressure by evacuation ing. At a predetermined
position on the upper surface of the paper mesh support portion 1, a cone-shaped paper mesh 4
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corresponding to the shape of the diaphragm to be manufactured is provided. A mask plate
(rectifying plate) 7 is provided on the outside of the paper mesh 4. The outer peripheral portion
of the mask plate 7 is fixed to the lower inner peripheral surface of the paper making tank 6 into
which the slurry 5 of the fiber material such as pulp fiber can be injected as the fiber material.
The paper making tank 6 is disposed on the papermaking support 1, and the inner surface side
of the mask plate 7 is disposed opposite to the papermaking net 4 provided on the papermaking
support 1. As the above-mentioned fiber material, one kind or two or more kinds are selected
from pulp fibers, synthetic fibers and inorganic fibers.
A slurry introduction hole 7a of fiber material is formed in the upper central portion of the mask
plate 7, and a recess 7b is formed in the lower inner surface of the mask plate 7. This recess 7b
is formed of a slurry introduction hole 7a of fiber material. The slurry of the fiber material can be
introduced into the recess 7 b through the slurry introduction hole 7 a of the fiber material. The
inner surface of the concave portion 7b is formed in a cone shape corresponding to the shape of
the diaphragm to be manufactured, and is disposed opposite to the paper mesh 4 with a
predetermined gap. The slurry introduction hole 7 a of the fiber material is located above the
central portion 4 a of the papermaking mesh 4. Further, the lower outer peripheral portion 7 c of
the mask plate 7 is in contact with the outer peripheral portion of the paper making net 4 on the
paper making net support portion 1. In this case, the lower outer peripheral portion 7 c of the
mask plate 7 is detachably attached to the upper surface of the outer peripheral portion of the
paper making net 4 of the paper making net support portion 1. If it is configured to be
removable, it is possible to easily take out the paper layer which is a papermaking product.
Further, if several types of recesses 7 b with different depths are prepared, the desired mask
plate 7 can be replaced as needed. Above the paper making tank 4, a tip of a fiber material
supply pipe 9 connected to a raw material tank 8 is provided. The pipe 9 is provided with a
control valve 10 for supplying a fiber material. This manufacturing apparatus can be realized
relatively easily simply by producing the mask plate 7 and providing the mask plate 7 above the
existing paper-making net support portion 1, and effective use of the existing equipment. The
cost of equipment can be reduced. Next, the operation will be described. First, as shown in FIG. 2,
the paper making tank 6 in which the mask plate 7 is set on the lower inner circumferential
surface is moved downward as shown by the arrow A, and as shown in FIG. Place on the part 1
Next, as shown in FIG. 1, a predetermined amount of the fiber material slurry 5 in the raw
material tank 8 is injected into the paper making tank 6 through the pipe 9 and the adjusting
valve 10. Thereafter, the vacuum pump 2 is operated to decompress the inside of the
papermaking support 10. Then, as shown by the arrows, the slurry 5 of the fiber material in the
paper making tank 6 enters the mask plate 7 through the slurry introduction hole 7 a of the fiber
material of the mask plate 7 and the periphery from the central portion 4 a of the paper sheet 4
It becomes a flowing water stream while spreading to the part. The pulp fibers are laminated on
the upper surface of the paper mesh 4 while forming a paper layer while being appropriately
entangled in parallel along the flow.
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That is, since the slurry 5 of the fiber material flows from the central portion 4 a of the
papermaking mesh 4 to the peripheral portion thereof, the pulp fibers are oriented radially from
the central portion to the peripheral portion. After forming the paper layer, as shown by arrow B
in FIG. 2, the paper making tank 6 is moved upward, the paper layer is taken out and dried, and a
paper making diaphragm can be manufactured. FIG. 3A is a plan view of the diaphragm 11
schematically showing the orientation state of pulp fibers, and FIG. 3B is a side view. The dashed
line 11a shown radially in the drawing is the orientation direction of the pulp fibers. The physical
properties of the diaphragm of the present invention manufactured using NBKP as the main
material as described above and the physical properties of the diaphragm according to the
conventional example are as follows. <img class = "EMIRef" id = "198241674-00003" /> In the
above, the conventional example is a papermaking diaphragm in which pulp fibers are
intertwined at random. In the product of the present invention, Young's modulus, sound velocity,
specific bending rigidity, and the like in the radial direction are improved from the
circumferential direction. FIG. 3 shows frequency characteristics in which the product of the
present invention and the conventional product (in which the orientation direction of the pulp
fibers is at random) are compared. As described above, according to the present invention, as can
be seen from the above-mentioned physical property values, the Young's modulus in the sound
propagation direction (radial direction) is improved, so the sound speed is improved, the high
region is extended, and the sound quality is excellent. You can get it. Although the configuration
example in which the paper making tank 4 is disposed above the paper making net support
portion 1 has been shown as the apparatus of the above embodiment, as shown in FIG. 5, the
inside of a relatively large paper making tank 6A is shown. The mask support plate 7 and the
paper mesh support 1 provided with the paper mesh 4 may be set, and after setting, the type in
which the slurry 5 of the fiber material can be injected may be used. Embodiment 2 FIG. 6 shows
Embodiment 2 of the present invention. The second embodiment is different from the first
embodiment in that a slurry introduction hole 7d of a fiber material communicating with the
recess 7b is formed on the lower side portion of the mask plate 7. In the second embodiment, the
pressure of the inside of the papermaking net supporting portion 1 is reduced to form a flow of
the slurry 5 of the fiber material from the peripheral portion of the papermaking mesh 4 toward
the central portion 4a to form a paper layer. It has a feature. The other configuration is the same
as that of the first embodiment, and the second embodiment can obtain the same function and
effect as those of the first embodiment described above.
In the above embodiments, when paper is made, various fibers such as aramid fibers, various
fibers such as carbon fibers, scaly mica, whiskers and the like are mixed in the solution as a
reinforcing material, and vibration is caused. It is also possible to form the plate of a composite
material, and by adjusting the type, amount and the like of the reinforcing material, it is possible
to obtain desired physical properties suited to the application. The present invention can be
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applied to the production of a low, medium and high tone papermaking diaphragm. According to
the first to third aspects of the present invention, it is possible to easily obtain a diaphragm in
which the fiber material is oriented in the radial direction by utilizing the water flow. According
to the fourth and fifth aspects of the present invention, the radial flow of water can be easily
generated by the mask plate 7 having a simple configuration, whereby a diaphragm in which the
fiber material is oriented in the radial direction can be obtained. According to the sixth aspect, a
diaphragm in which the fiber material is oriented in the radial direction can be easily
manufactured by the device having a simple configuration. Further, it is sufficient to improve
only a part of the existing equipment, and it is possible to suppress the cost of the equipment
cost, which in turn can suppress the cost increase of the diaphragm. According to the diaphragm
of the seventh aspect, since the orientation direction of the fiber material is the radiation
direction which is the propagation direction of the sound, the Young's modulus in the radiation
direction is improved and the sound velocity is improved. It has an effect of being good. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 shows a schematic block diagram of an example of a
manufacturing apparatus according to a first embodiment of the present invention. FIG. 2 is an
explanatory view of an assembled state of the same manufacturing apparatus. 3 (a) is a plan view
of a diaphragm schematically showing the orientation of pulp fibers, and FIG. 3 (b) is a side view
of the same. FIG. 4 is a frequency characteristic diagram comparing a conventional product and a
product of the present invention. FIG. 5 shows another example of the manufacturing apparatus
according to the first embodiment of the present invention. FIG. 6 is a schematic explanatory
view of a manufacturing apparatus of a second embodiment of the present invention. FIG. 7
shows a prior art example. [Explanation of the code] 1 Paper-making network support part 2
Vacuum pump 3 Vacuum control valve 4 Paper-making network 4a Paper-making network
central part 5 Slurry of fiber material 6, 6A Paper-making tank 7 Mask plate 7a, 7d 7c Mask
plate lower periphery 8 Raw material tank 9 Pipe 10 Adjustment valve 11 Vibrating plate 11a
Orientation direction of pulp fiber
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