JP2004080465

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DESCRIPTION JP2004080465
An object of the present invention is to provide a manufacturing method and an apparatus
capable of preventing inter-layer mixing and obtaining a uniform multi-layered papermaking
diaphragm. A first layer is formed by a first papermaking net (1) provided in a first paper making
tank (2) and an inserted pulp slurry P1, and the first layer is conveyed while being adsorbed. The
second papermaking net which is transported separately to the second paper making tank (7)
prepared separately by means (6) and contains different pulp slurry P2 and which adsorbs the
first layer to this transport means (6) (4) is provided, and a cylindrical pressure partition (5) is
provided substantially at the outer peripheral portion of the second papermaking net (4), and the
second paper making tank (7) is provided in the pressure partition (5) And the second layer is
formed on the first layer. [Selected figure] Figure 1
Method and apparatus for manufacturing diaphragm for electroacoustic transducer
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a diaphragm for an electroacoustic transducer used in an acoustic
device and a manufacturing apparatus therefor. There are various types of diaphragms for
electro-acoustic transducers, but they are lightweight and highly rigid, and the desired
performance can be easily obtained by controlling the manufacturing conditions, and the degree
of freedom Pulp papermaking diaphragms have been used for a long time. Although this
diaphragm is manufactured through a paper making process, in general, a single layer can be
manufactured by one paper making process. However, the physical properties required for the
diaphragm include elasticity, rigidity, internal loss and the like. In addition, as environmental
stability, there are water resistance, heat resistance, flame retardance, etc. In addition, recently
there is also a demand from the design aspect, and in order to meet these contradictory
requirements, it is made from a single material It is difficult with a single-layer diaphragm. As a
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method of satisfying various contradictory requirements, various proposals have been made on a
manufacturing method in which a diaphragm is formed by laminating layers having various
functions, and a multilayer structure having a performance which can not be obtained with a
single layer. ing. As a method of obtaining this diaphragm, generally, a plurality of single-layer
diaphragms are prepared, and they are respectively bonded with an adhesive to obtain a
multilayer diaphragm. However, in this case, the adhesive layer between each layer constitutes a
part of the diaphragm main body in addition to the inherent adhesive function, and the mass is
increased, and the properties required of the diaphragm are satisfied. On the contrary, there are
many cases where it is an obstacle Therefore, without using an adhesive, a multilayer structure is
formed at the paper making stage, and the respective layers are united and integrated using
entanglement at the time of paper making of the respective materials, and dried by heating to
manufacture a diaphragm. Various wet multi-layered papermaking diaphragms have been
proposed. FIG. 4 shows a representative example 1 of the prior art. In this conventional example
1, the first pulp slurry P1 is sent from the raw material tank 32 to the paper making tank 31
provided above the paper making net 30, and another raw material tank 33 is made in the same
paper making tank 31 before paper making is completed. A second pulp slurry P2 having
different physical properties is sent, and paper making is sequentially carried out in this manner
to obtain a multilayer diaphragm. In the figure, reference numerals 34 and 35 denote control
valves for supplying pulp slurry, 36 denotes a control valve for vacuuming, and 37 denotes a
vacuum pump. FIG. 5 shows another typical example 2 of the prior art. In this conventional
example 2, the first pulp slurry P1 is fed from the raw material tank 42 to the paper making tank
41 provided below the freely movable paper making net 40, and the paper making net 40 is sunk
in the paper making tank 41 to make paper. The paper mesh 40 is raised to form a first layer.
Further, the pulp slurry P1 remaining in the same paper making tank 41 is removed, and then
the second pulp slurry P2 is sent from the raw material tank 43, and paper making is
sequentially performed thereafter to obtain a multilayer diaphragm. In the figure, reference
numerals 44 and 45 denote adjustment valves for supplying pulp slurry, reference numeral 46
denotes an adjustment valve for vacuuming, and reference numeral 47 denotes a vacuum pump.
However, in the conventional example 1 shown in FIG. 4, before the first pulp slurry P1 in the
paper making tank 31 is finished with paper making, the second pulp from the raw material tank
32 is used. Slurry P2 has to be sent, and it must be stirred and mixed with the first pulp slurry
P1, and it is difficult to control this stirring and mixing, resulting in a clear interface between the
first and second layers at the end of papermaking. It has the disadvantage that it is difficult to
control the first layer and the second layer in the middle of the two layers, resulting in a complex
intermingled intermediate layer. In the conventional example 2 shown in FIG. 5, after forming the
first layer, the second pulp slurry P2 is sent to the same paper making tank 41, and the paper
mesh 40 is sunk in the paper making tank 41 to make the second layer paper making. The first
paper layer is formed on the papermaking mesh 40, and the paper layer contains about 80% of
water, and is in a state of being easily flowed and deformed by an external force. When the paper
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layer on the papermaking net 40 sinks in the papermaking tank 41, it is disturbed by the water
flow of the pulp slurry flowing into the papermaking netting 40 from the surroundings, and as a
result there is a defect that uniform papermaking can not be obtained. Further, in both of the
conventional examples 1 and 2, since the same paper making tank 31, 41 is used for two paper
makings, mixing of the first pulp slurry P1 and the second pulp slurry P2 is avoided. If the
difference in color tone between the two raw materials is large, it may also cause appearance
defects. The present invention has been proposed in view of the above, and the object of the
present invention is to provide a manufacturing method capable of preventing mixing of layers
and obtaining a papermaking diaphragm having a uniform multilayer structure and the same. It
is in providing an apparatus. According to the present invention, a first layer is formed by a first
papermaking mesh 1 provided in a first papermaking tank 2 and a pulp slurry P1 contained
therein. The first layer is adsorbed to the second paper making tank 7 separately prepared by the
conveying means 6 and containing different pulp slurries P2 while the layer 1 is adsorbed, and
the second layer adsorbs the first layer to the conveying means 6. A paper mesh 4 is provided,
and a cylindrical pressure partition 5 is provided substantially at the outer peripheral portion of
the second paper mesh 4, and the liquid level of the second paper making tank 7 rises in the
pressure partition 5, and the above-mentioned The present invention is characterized in that the
diaphragm is manufactured by forming the second layer on the first layer.
In addition, a predetermined number of layers are sequentially formed on the second layer
through another bath separately prepared in advance to obtain a diaphragm having a desired
multilayer structure of two or more layers. There is. Furthermore, the apparatus for
manufacturing this diaphragm is formed through the first paper making tank 2 provided with the
first paper making mesh 1 forming the first layer, and the first paper making tank 2. Transport
means 6 for transporting the first layer to a predetermined position, and a second paper making
up the first layer transported from the transport means 6 and forming a second layer thereon
The transport means 6 adsorbs the first layer, and a second paper mesh 4 capable of forming a
second layer on the adsorbed first layer is provided; By providing a substantially cylindrical
pressure partition 5 which is opposed to and immersed in the liquid surface of the second paper
making tank 7 in the outer peripheral portion of the paper making mesh 4 of 2, and the liquid
level can rise inside. The above objective is achieved. BEST MODE FOR CARRYING OUT THE
INVENTION In the present invention, the paper making tanks forming the respective layers are
different paper making tanks. Then, when the second layer is formed via the second paper
making tank 7, the turbulent flow of the pulp slurry in the tank is prevented by the pressure
dividing wall 5, and there is no mixing of the pulp slurries, and it is uniform. It is possible to form
a layer. FIG. 1 shows a schematic configuration of an apparatus according to an embodiment of
the present invention. This apparatus comprises a first paper making apparatus 3 having a first
papermaking mesh 1 for making a first layer paper making and a first paper making tank 2, and
a second paper making it possible to adsorb the first layer paper making. A conveying means 6
capable of conveying the first layer of papermaking to a predetermined position, and a second
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layer of papermaking, having a papermaking net 4 and having a substantially cylindrical
pressure partition 5 extending downward at the outer peripheral portion thereof. And a second
paper making apparatus 8 having a second paper making tank 7 to be carried out. The first
papermaking apparatus 3 has a substantially funnel shape, and a first papermaking net 1 having
a shape corresponding to the diaphragm shape for the electroacoustic transducer is provided on
the upper portion in a lid shape on the upper opening. The first papermaking support 9 is
provided. A first paper making tank 2 is detachably provided on the upper outer peripheral
portion of the first paper making web 1. As a detachable means, for example, a papermaking tank
2 and a hinge connecting to the papermaking net support 9 are provided in part, and the paper
making tank 2 is removed by rotating the upper paper making tank 2 outward through this hinge
to remove the paper making tank 2 It should be a structure. Other suitable structures may be
adopted, and the paper making tank 2 may be of an attachment / detachment structure by bolts,
nuts or the like.
The first paper making tank 2 is formed of a hollow cylindrical cylindrical part, the bottom of the
cylindrical part is provided on the outer periphery of the first paper making tank 1 and pulp
slurry as a paper making material is provided inside. Will be inserted. Reference numeral 10
denotes a first raw material tank capable of supplying the pulp slurry P 1 into the first paper
making tank 2, and a pipe 11 for carrying the raw material is provided at the lower portion, and
its front end portion is provided with a first adjusting valve 12. It is disposed above the first
paper making tank 2 via the first control valve 12 so that a predetermined amount of pulp slurry
P1 can be injected into the first paper making tank 2 via the first adjustment valve 12. A hole 13
is provided in the lower central portion of the first papermaking support portion 9, and a first
vacuum pump 15 is provided behind the hole 13 via a second adjustment valve 14. Reference
numeral 16 denotes a second papermaking net supporting portion which is a component of the
transporting means, which has a substantially funnel shape, and is provided with the second
papermaking net 4 at the lower part. The second paper mesh 4 has a shape substantially
corresponding to that of the first paper mesh 1, and is configured to be capable of adsorbing the
first paper layer formed on the first paper mesh 1 at the lower part thereof. ing. That is, a hole
17 is formed in the upper central portion of the second papermaking support 16, and a third
adjusting valve 18 is provided behind the hole 17, and a vacuum pump 19 is further provided
behind it. The first paper layer can be adsorbed by operating the vacuum pump 19 and the
adjusting valve 18. Further, as described above, the pressure dividing wall 5 is provided
downward in the lower part of the outer periphery of the second papermaking support 4. As
shown in FIG. A member such as a wire (not shown) is provided on the upper part of the second
papermaking support 16, and this member is connected to a member such as a winch (also not
shown), like a wire. While being able to move up and down by winding up and down the above
members, it is movable to a predetermined position via a transport device (not shown). The
transport apparatus is provided with, for example, a guide rail 20, and can be easily realized by a
carriage 21 capable of traveling via the guide rail 20, a drive motor for wheel rotation (not
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shown) provided on the carriage, and the like. obtain. The second raw material tank 22 for the
second paper making tank 7 is a pulp slurry P 2 having different physical properties from the
pulp slurry P 1 in the first raw material tank 10. A pipe 23 is connected to the lower portion of
the second raw material tank 22, and the tip end of the pipe 23 is provided above the second
paper making tank 7 via a control valve 24.
Next, a method of producing the electroacoustic diaphragm according to the present invention
will be described. First, in the first layer process, the pulp slurry P1 is sent from the first raw
material tank 10 to the paper making tank 2 provided above the first paper making mesh 1, and
then the second adjustment valve below the paper making mesh 14 is opened, the pulp slurry P1
is suctioned by the action of the vacuum pump 15, and a paper layer is formed on the first
papermaking net 1, and after completion of paper making, suction and conveyance of the second
paper layer For this reason, the first paper making tank 2 is removed. Then, as shown in FIG. 2,
the conveying means 6 having the pressure partition 5 having an opening downward is disposed
downward above the first paper layer 25 made of paper making. The second papermaking net 4
attached to the transport means 6 is brought into close contact with the first paper layer 25. In
this case, the pressure dividing wall 5 is located on the outer periphery of the first papermaking
support 9 and does not collide with it. Next, the third adjusting valve 18 is opened, and the paper
layer 25 is sucked and transferred onto the second paper making mesh 4 by the vacuum pump
19. The first papermaking mesh 1 having transferred the paper layer 25 is prepared for the next
papermaking. Next, the conveyance means 6 to which the paper layer 25 is transferred is
horizontally moved above the second paper making tank 7 for the second layer paper making via
the conveyance device, and thereafter to the second layer paper making process. enter. As shown
in FIG. 1, in the second paper making tank 7 in which the second layer paper making is
performed, the pulp slurry P 2 is previously maintained at a constant water level by the second
raw material tank 22 and the adjusting valve 24. As shown in FIG. 3, the conveying means 6
located above it has a paper layer 25 in close contact with the second paper sheet 4 in a state of
being sucked by the vacuum pump 19. The conveying means 6 is provided with a pressure
dividing wall 5 having an open surface facing the liquid surface of the pulp slurry P2. Next, the
transport means 6 is lowered toward the liquid level of the pulp slurry P2. When the lower end
of the pressure partition 5 enters the liquid surface of the pulp slurry P2, the descent of the
transfer means 6 is stopped. Next, the liquid level inside the pressure dividing wall 5 starts to rise
by suction by the vacuum pump 19 provided in the transport means 6, and when the liquid level
reaches the paper layer 25, the second layer papermaking is performed. It is started. At this time,
the liquid level rises horizontally and in a laminar flow state by suction by the vacuum pump 19,
and the pulp slurry P 2 does not disturb the paper layer 25 prepared in advance. When the
required second paper layer (not shown) is formed, the transport means 6 is moved up to the
original position, and separated from the liquid surface of the pulp slurry P 2 to form the second
layer. Finish papermaking.
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After this, the paper layer which has become two layers in accordance with the normal
diaphragm is taken out and subjected to the heating and drying process to complete as a
diaphragm. If lamination of two or more layers is required, a third papermaking tank (not shown)
is sequentially provided thereafter, and the movement, lowering, and raising of the transfer
device are repeated in substantially the same manner. It is possible to obtain a multilayer
diaphragm with the number of layers. In the above, the first layer papermaking may be produced
as follows. That is, as shown in FIG. 5, the pulp slurry P1 is sent from the raw material tank 42 to
the paper making tank 41 provided below the paper making net 40, and the paper making net
40 is sunk in the paper making tank 41. The adjustment valve 46 is opened, and the pulp slurry
P1 is sucked by the action of the vacuum pump 47 to form a paper layer on the paper mesh, and
then the paper mesh 40 is raised to complete the first layer papermaking. In addition to the
above two examples, the first layer papermaking may be formed by selecting any conventionally
used papermaking method according to the properties of the target paper layer. As described
above, according to the diaphragm manufacturing method and apparatus of the present
invention, the first layer paper making tank and the second layer paper making tank are
completely separated from each other. The pulp slurries P1 and P2 are not mixed, and it
becomes possible to manage both layers in the best condition in terms of both performance and
appearance. Further, since the second layer papermaking is performed by raising the liquid level
in a horizontal and laminar flow state from below due to the presence of the pressure partition 5,
the turbulent flow state of the second layer pulp slurry according to the conventional example
Disturbance due to inflow can be avoided, and as a result uniform papermaking is possible in
both layers. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a schematic block diagram of
an embodiment of the present invention. FIG. 2 is an explanatory view of the operation of the
present invention. FIG. 3 is an explanatory view of the operation of the present invention. FIG. 4
shows a first prior art example. FIG. 5 shows a second prior art example. Explanation of the code
1 1st papermaking network 2 1st papermaking tank 3 1st papermaking device 4 2nd
papermaking network 5 pressure partition 6 conveyance expedient 7 2nd paper making tank 8
2nd paper making equipment 9 1st No. of paper web support 10 first raw material tank 11 pipe
12 first control valve 13 hole 14 second control valve 15 first vacuum pump 16 second paper
web support 17 hole 18 third control valve 19 Vacuum pump 20 Guide rail 21 Carriage 22
Second raw material tank 23 Pipe 24 Adjustment valve 25 First layer paper layer
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