JP3909584B2 - Method and apparatus for manufacturing diaphragm for electroacoustic transducer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a diaphragm for an electroacoustic transducer used in an acoustic device and a manufacturing apparatus therefor.
[0002]
[Prior art]
There are various types of diaphragms for electroacoustic transducers, but they are lightweight and highly rigid, and the desired performance can be easily obtained by controlling the manufacturing conditions, and the pulp-making diaphragm with flexibility is old. Has been used a lot.
[0003]
Although this diaphragm is manufactured through a papermaking process, a single-layered diaphragm can usually be manufactured in one papermaking process.
[0004]
However, physical properties required for the diaphragm include elasticity, rigidity, internal loss, and the like. In addition, environmental stability includes water resistance, heat resistance, flame retardancy, etc. In addition, recently, there is a demand from the design aspect, and paper is made from one kind of material to satisfy these conflicting requirements. This is difficult with a single-layer diaphragm.
[0005]
As a method for satisfying these various conflicting requirements, various manufacturing methods have been proposed in which a diaphragm is formed by laminating layers having various functions to have a multilayer structure having performance that cannot be obtained by a single layer.
[0006]
As a method of obtaining this diaphragm, generally, a plurality of single-layer diaphragms are prepared, and these are bonded together with an adhesive to obtain a multilayer diaphragm.
[0007]
However, in this case, the adhesive layer between the layers constitutes a part of the diaphragm main body in addition to the original adhesive function, and the mass is increased. In many cases.
[0008]
For this reason, without using an adhesive, a multilayer structure is formed at the paper making stage, and the layers are combined and integrated using the entanglement during the paper making between the materials, and dried by heating to produce a diaphragm. Various multilayer papermaking diaphragms have been proposed.
[0009]
FIG. 4 shows a typical conventional example 1. In this conventional example 1, the first pulp slurry P1 is sent from the raw material tank 32 to the papermaking tank 31 provided above the papermaking net 30, and another raw material tank 33 is supplied to the same papermaking tank 31 before the papermaking is completed. A second pulp slurry P2 having different physical properties is fed, and paper making is sequentially performed in this manner, thereby obtaining a multilayer diaphragm. In the figure, 34 and 35 are regulating valves for supplying pulp slurry, 36 is a regulating valve for evacuation, and 37 is a vacuum pump.
[0010]
FIG. 5 shows another typical example 2 of the prior art. In this conventional example 2, the first pulp slurry P1 is sent from the raw material tank 42 to the papermaking tank 41 provided below the vertically movable papermaking net 40, the papermaking net 40 is submerged in the papermaking tank 41, and papermaking is performed. The papermaking net 40 is raised to form the first layer. Further, the pulp slurry P1 remaining in the same papermaking tank 41 is removed, and then the second pulp slurry P2 is sent from the raw material tank 43, and thereafter papermaking is sequentially performed to obtain a multilayer diaphragm. In the figure, 44 and 45 are adjustment valves for supplying pulp slurry, 46 is an adjustment valve for evacuation, and 47 is a vacuum pump.
[0011]
[Problems to be solved by the invention]
However, in the prior art example 1 shown in FIG. 4, before the first pulp slurry P1 in the papermaking tank 31 is finished, the second pulp slurry P2 is sent from the raw material tank 32 and the first pulp slurry P1 and Stirring and mixing must be performed, and it is difficult to control the stirring and mixing. As a result, the first layer and the second layer do not have a clear interface at the end of paper making, and one layer is located between both layers. It has the disadvantage that an intermediate layer that is difficult to control and that is mixed and complicated is produced.
[0012]
In the conventional example 2 shown in FIG. 5, after the first layer is formed, the second pulp slurry P2 is sent to the same papermaking tank 41, and the papermaking net 40 is submerged in the papermaking tank 41 to perform the second layer papermaking. A first paper layer is formed on the papermaking net 40. This paper layer contains about 80% of water and is in a state of easily flowing and deforming by an external force. When the paper layer on the papermaking net 40 sinks into the papermaking tank 41, it is disturbed by the water flow of the pulp slurry flowing into the papermaking net 40 from the surroundings, and as a result, a uniform papermaking cannot be obtained.
[0013]
Moreover, since the same papermaking tanks 31 and 41 are used for papermaking twice in both methods of Conventional Examples 1 and 2, it is inevitable that the first pulp slurry P1 and the second pulp slurry P2 are mixed. When the difference in color tone between the two raw materials is large, it may cause poor appearance.
[0014]
The present invention has been proposed in view of the above, and an object of the present invention is to provide a manufacturing method and apparatus capable of preventing mixing between layers and obtaining a papermaking diaphragm having a uniform multilayer structure. There is to do.
[0015]
[Means for Solving the Problems]
In the present invention, a first layer is formed by the first papermaking net 1 provided in the first papermaking tank 2 and the pulp slurry P1 put in the first papermaking tank 2, and the conveying means 6 separates the first layer while adsorbing the first layer. It is prepared and transported to a second papermaking tank 7 containing different pulp slurry P2, and this transporting means 6 is provided with a second papermaking network 4 for adsorbing the first layer, and this second papermaking. A substantially cylindrical pressure partition wall 5 is provided on the outer periphery of the net 4, and the liquid level of the second papermaking tank 7 rises in the pressure partition wall 5 to form a second layer on the first layer. Thus, the vibration plate is manufactured.
[0016]
Further, a predetermined number of layers are sequentially formed on the second layer through another tank separately prepared in advance, so that a diaphragm having a desired multilayer structure of two or more layers is obtained.
[0017]
Furthermore, an apparatus for manufacturing the diaphragm includes a first papermaking tank 2 provided with a first papermaking net 1 for forming a first layer, and the first papermaking tank 2 formed through the first papermaking tank 2. A transport means 6 for transporting one layer to a predetermined position, and a second papermaking tank 7 in which the first layer transported from the transport means 6 is placed and a second layer is formed thereon. The transport means 6 is provided with a second papermaking net 4 capable of adsorbing the first layer and capable of forming a second layer on the adsorbed first layer. The second papermaking The above object is achieved by providing a substantially cylindrical pressure partition wall 5 that is immersed in the outer peripheral portion of the net 4 and is immersed in the second papermaking tank 7 so that the liquid level can rise. Have achieved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the papermaking tanks for forming each layer are used as separate papermaking tanks. And when forming the 2nd layer through the 2nd papermaking tank 7, it is made to prevent the turbulent flow of the pulp slurry in the tank by the pressure partition 5, and there is no mixing of each pulp slurry, and it is uniform A layer can be formed.
[0019]
【Example】
FIG. 1 shows a schematic configuration of an apparatus according to an embodiment of the present invention.
[0020]
This apparatus includes a first paper making device 3 having a first paper making network 1 and a first paper making tank 2 for making the first layer of paper, and a second paper making network 4 capable of adsorbing the first layer of paper making. , A substantially cylindrical pressure partition wall 5 extending downward on the outer periphery thereof, a conveying means 6 capable of conveying the first layer of paper to a predetermined position, and a second layer for performing the second layer of paper. And a second papermaking apparatus 8 having a papermaking tank 7.
[0021]
The first papermaking apparatus 3 has a substantially funnel shape, and a first papermaking net 1 having a shape corresponding to the shape of a diaphragm for an electroacoustic transducer is provided on the upper opening in a lid shape. The paper net support 9 is provided.
[0022]
A first papermaking tank 2 is detachably provided on the upper outer peripheral portion of the first papermaking net 1. As a detachable means, for example, a papermaking tank 2 and a hinge connected to the papermaking net support 9 are provided in a part, and the upper papermaking tank 2 is rotated to the outside via this hinge to remove the papermaking tank 2. A structure may be used. Other appropriate structures may be used, and the papermaking tank 2 may be attached and detached with bolts, nuts, or the like.
[0023]
The first papermaking tank 2 is formed of a hollow cylindrical cylindrical portion, the bottom of the cylindrical portion is provided on the outer periphery of the first papermaking tank 1, and pulp slurry as a papermaking material is placed inside the first papermaking tank 2. .
[0024]
Reference numeral 10 denotes a first raw material tank capable of supplying the pulp slurry P1 into the first papermaking tank 2, and a pipe 11 for conveying the raw material is provided in the lower part, and the tip thereof is connected to the first paper through the first regulating valve 12. A pulp slurry P <b> 1 can be injected into the first papermaking tank 2 via the first regulating valve 12 so as to be placed above one papermaking tank 2.
[0025]
A hole 13 is provided in the lower central part of the first papermaking net support 9, and a first vacuum pump 15 is provided behind the hole 13 via a second regulating valve 14.
[0026]
Reference numeral 16 denotes a second papermaking net support portion which is a constituent member of the conveying means, which has a substantially funnel shape and is provided with a second papermaking net 4 at the bottom.
[0027]
The second papermaking net 4 has a shape substantially corresponding to that of the first papermaking net 1 and is configured so that the first paper layer formed on the first papermaking net 1 can be adsorbed to the lower part thereof.
[0028]
That is, a hole 17 is formed in the upper center portion of the second papermaking net support portion 16, a third adjustment valve 18 is provided behind the hole 17, and a vacuum pump 19 is provided behind the hole. By operating the vacuum pump 19 and the regulating valve 18, the first paper layer can be adsorbed.
[0029]
Further, as described above, the pressure partition wall 5 is provided in the lower part of the outer periphery of the second papermaking net support part 4 as described above.
[0030]
Although not shown in the drawing, a member such as a wire is provided on the upper portion of the second papermaking net support portion 16, and this member is connected to a member such as a winch (also not shown). It is configured to be able to move up and down by being rolled up or down, and is movable to a predetermined position via a transport device (not shown).
[0031]
The conveyance device can be easily realized by, for example, a guide rail 20 and a carriage 21 that can travel through the guide rail 20, a wheel rotation drive motor (not shown) provided on the carriage, and the like.
[0032]
Reference numeral 22 denotes a second raw material tank for the second papermaking tank 7 in which a pulp slurry P2 having different physical properties from the pulp slurry P1 in the first raw material tank 10 is placed.
[0033]
A pipe 23 is connected to the lower part of the second raw material tank 22, and the tip of the pipe 23 is provided above the second papermaking tank 7 via an adjustment valve 24.
[0034]
Next, a method for producing the electroacoustic diaphragm according to the present invention will be described.
[0035]
First, in the first layer process, the pulp slurry P1 is sent from the first raw material tank 10 to the papermaking tank 2 provided above the first papermaking net 1, and then the second regulating valve 14 below the papermaking net is opened. Then, the pulp slurry P1 is sucked by the action of the vacuum pump 15 to form a paper layer on the first papermaking net 1, and after the papermaking is finished, for suction and conveyance of the second paper layer, The first papermaking tank 2 is removed.
[0036]
Next, as shown in FIG. 2, the conveying means 6 provided with the pressure bulkhead 5 having an opening toward the lower side, which is disposed above the first paper layer 25 on which the paper is made, is lowered, and the conveying means The second papermaking net 4 attached to 6 is brought into close contact with the first paper layer 25. In this case, the pressure partition 5 is located on the outer periphery of the first papermaking net support 9 and does not collide.
[0037]
Next, the third adjustment valve 18 is opened, and the paper layer 25 is sucked and transferred to the second papermaking net 4 by the vacuum pump 19. The first papermaking net 1 having transferred the paper layer 25 is prepared for the next papermaking.
[0038]
Next, the conveying means 6 to which the paper layer 25 is transferred is moved horizontally through the conveying device above the second papermaking tank 7 for the second layer papermaking, and then the second layer papermaking process is started.
[0039]
As shown in FIG. 1, the pulp slurry P <b> 2 is previously maintained at a constant water level by the second raw material tank 22 and the regulating valve 24 in the second papermaking tank 7 that performs the second layer of papermaking. As shown in FIG. 3, the conveying means 6 located above the sheet has a paper layer 25 in close contact with the second papermaking net 4 in a state of being sucked by the vacuum pump 19.
[0040]
The conveying means 6 is provided with a pressure partition wall 5 having an open surface facing the liquid surface of the pulp slurry P2.
[0041]
Next, the conveying means 6 is lowered toward the liquid level of the pulp slurry P2. When the lower end of the pressure partition wall 5 enters the liquid level of the pulp slurry P2, the lowering of the conveying means 6 is stopped.
[0042]
Next, the liquid level inside the pressure partition wall 5 starts to rise due to suction by the vacuum pump 19 provided in the conveying means 6, and when the liquid level reaches the paper layer 25, the second layer of papermaking is started. .
[0043]
At this time, the liquid level rises in a horizontal and laminar flow state by suction by the vacuum pump 19, and the pulp slurry P2 does not disturb the paper layer 25 prepared in advance.
[0044]
When the required second paper layer (not shown) is formed, the conveying means 6 is moved up to the original position, separated from the liquid level of the pulp slurry P2, and the second paper making is completed. To do.
[0045]
Thereafter, the two paper layers are taken out in accordance with a normal diaphragm, and the diaphragm is completed through a heat drying process.
[0046]
If two or more layers are required, a third papermaking tank (not shown) is provided in sequence, and the number of required layers is increased by repeating the movement, lowering, and raising of the conveying device in substantially the same manner. A multilayer diaphragm can be obtained.
[0047]
In the above description, the first layer of papermaking may be produced as follows.
[0048]
That is, as shown in FIG. 5, the pulp slurry P1 is sent from the raw material tank 42 to the papermaking tank 41 provided below the papermaking net 40, the papermaking net 40 is submerged in the papermaking tank 41, and the adjustment valve 46 below the papermaking net 41. And the pulp slurry P1 is sucked by the action of the vacuum pump 47 to form a paper layer on the papermaking net, and then the papermaking net 40 is raised to complete the first papermaking.
[0049]
In addition to the above two examples, the first papermaking may be formed by selecting any conventional papermaking method according to the properties of the target paper layer.
[0050]
【The invention's effect】
As described above, according to the diaphragm manufacturing method and apparatus of the present invention, the first papermaking tank and the second papermaking tank are completely separated, and the pulp slurries P1 and P2 in both tanks are mixed. In other words, both layers can be managed in the best condition in terms of both performance and appearance.
[0051]
In addition, since the second layer papermaking is performed by raising the liquid level in the horizontal and laminar flow state from below due to the presence of the pressure partition wall 5, inflow of the second layer pulp slurry in the turbulent state according to the conventional example Can be avoided, and as a result, both layers can be made uniformly.
[Brief description of the drawings]
FIG. 1 shows a schematic configuration diagram of an embodiment of the present invention.
FIG. 2 is a diagram for explaining the operation of the present invention.
FIG. 3 is a diagram for explaining the operation of the present invention.
FIG. 4 shows a first conventional example.
FIG. 5 shows a second conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st papermaking net | network 2 1st papermaking tank 3 1st papermaking apparatus 4 2nd papermaking net 5 Pressure partition 6 Conveying means 7 2nd papermaking tank 8 2nd papermaking apparatus 9 1st papermaking network support part DESCRIPTION OF SYMBOLS 10 1st raw material tank 11 Pipe 12 1st regulating valve 13 Hole 14 2nd regulating valve 15 1st vacuum pump 16 2nd papermaking network support part 17 Hole 18 3rd regulating valve 19 Vacuum pump 20 Guide rail 21 Cart 22 Second raw material tank 23 Pipe 24 Regulating valve 25 First paper layer

Claims (3)

A first layer is formed by the first papermaking net (1) provided in the first papermaking tank (2) and the added pulp slurry P1, and conveying means (6) while adsorbing the first layer. And a second papermaking network (4) for adsorbing the first layer is conveyed to the second papermaking tank (7) separately prepared by the above and containing a different pulp slurry P2. And a substantially cylindrical pressure partition wall (5) is provided on the outer periphery of the second papermaking net (4), and the liquid level of the second papermaking tank (7) rises in the pressure partition wall (5). A method for producing a diaphragm for an electroacoustic transducer, wherein a second layer is formed on the first layer. 2. The method for manufacturing a diaphragm for an electroacoustic transducer according to claim 1, wherein a predetermined number of layers are sequentially formed on the second layer via another tank separately prepared in advance. A first papermaking tank (2) provided with a first papermaking net (1) for forming a first layer, and the first layer formed via the first papermaking tank (2) are predetermined. And a second papermaking tank (7) in which the first layer transported from the transport means (6) is placed and a second layer is formed thereon. And
The transport means (6) adsorbs the first layer and is provided with a second papermaking net (4) capable of forming a second layer on the adsorbed first layer. A substantially cylindrical pressure partition wall (5) is provided on the outer periphery of the papermaking net (4) so as to face the liquid level of the second papermaking tank (7) and be immersed, and the liquid level can rise inside. An apparatus for manufacturing a diaphragm for an electroacoustic transducer.

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