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TECHNICAL FIELD The present invention relates to a method of manufacturing a vibrating
member for a speaker such as a center cap and a diaphragm mainly made of wood pulp.
Background--Degumi Generally, as a vibration member for a speaker, there are a diaphragm, a
center cap and the like. In the cone type loudspeaker as shown in FIG. 1, the center cap 4 is
placed on the bobbin 2 at the center of the cone type diaphragm 3. The center cap 4 has a low
convex dome shape and serves as dustproofing for the magnetic gap 1 of the speaker and as a
reinforcing material inside the diaphragm or in the radial direction of the cone type diaphragm.
In addition, the material of the center cap and the diaphragm is manufactured by being selected
from materials such as pulp, plastic, woven fabric, non-woven fabric, metal and the like or
composite materials thereof in order to obtain desired performance. In particular, a material
mainly composed of pulp is a material which is inexpensive and exhibits excellent properties as a
diaphragm, and is also used for the center main 11 tub as widely used for a diaphragm.
Conventionally, as a method of manufacturing a diaphragm and a center cap from a material
mainly composed of wood pulp, for example, as shown in FIG. 2, the desired center cap is formed
in a suspension containing dyed wood pulp fibers. A fitting wire mesh 8 is placed and formed
into a sheet, and then heating and pressure treatment is performed with a die 10 conforming to
the shape of the desired center cap as in the case of the wire mesh to obtain the desired center
cap 4. Such a manufacturing method is inexpensive and does not waste material because it forms
a wood pulp fiber type direct center cap. However, due to the complexity of the process, each
process takes a long time, and is not necessarily suitable for mass production. In addition, for
example, in order to obtain diaphragms with different color tones, center caps, etc., it is
necessary to prepare raw materials with different color tones each time, and to clean all devices
such as transfer of raw materials and tank, piping, and pumps related to paper making. There
was a problem that it must be done. (1) Further, the object of the present invention is to make it
possible to easily switch the apparatus in the case of manufacturing a speaker pulp center cap or
diaphragm mainly composed of wood pulp with a small number of steps and obtaining center
caps of different color tones. It is providing a manufacturing method of an imaging moving
member for a speaker. The present invention comprises the steps of preparing a suspension in
which pulp fibers, sizing agents, fixing agents, and microfibers of a thermoplastic resin are mixed,
forming a continuous sheet of paper stock from the suspension, and The impregnation step of
impregnating the stock with water, sizing agent and dye, adjusting the water content of the wet
stock, and then applying heat and pressure to the stock to form it into a predetermined shape;
And a cutting step of cutting the material.
An embodiment of the present invention will be described below with reference to the attached
drawings. FIG. 3 shows a paper making process with a single cylinder building felt machine.
Suspension 11 containing 5 to 20% by weight of a highly fibrillated thermoplastic resin fibril and
a predetermined sizing agent, fixing agent, etc. to wood pulp first, ie, the raw material is prefilled
in the paper making tank . The raw material is attracted to the cylinder mold 13 and transferred
to the felt 15 by the roller 14. Thereafter, the sheet is pressed and dewatered by a press roller
16, dried by a dryer 17, and a sheet 18, ie, a sheet-like stock is wound around a roll 19. The
sheet 19 is wound on the roll 19 while being cut to a predetermined dimension width by a cutter
or the like. By blending the fibrillated thermoplastic resin fiber, the wet strength is increased and
the dimensional stability of the product is also improved as compared with the non-blended one.
Moreover, the strength against wet heat can be maintained by blending the sizing agent, that is,
by performing the inner surface sizing. FIG. 4 shows an impregnation step and a press forming
step. The sheet 18 wound on the roll 19 passes through the aqueous solution 20 of the sizing
agent and the dye, is impregnated with moisture and the sizing agent, and the dye, and the
moisture content is adjusted by the dewatering port 21. The temperature of the impregnating
solution at this time is kept constant by a heater, a cooler and the like. The impregnating solution
is constantly stirred. When the water content of the sheet 18 is 30% or less, wrinkles or sharps
occur on the surface of the sheet 18 at the time of the subsequent press molding. If the water
content is 70% or more, the wet strength may be significantly reduced and the sheet 18 may be
broken halfway. The moisture content of the sheet 18 is preferably 30 to 70%, and preferably 40
to 50%. It is difficult to adjust the moisture content to 40% to 50% simply by squeezing the
moistened sheet 18 with a roller. The dewatering roller 21 used in the present invention is
hollow and has a dewatering hole 22 as shown in FIGS. 5 (a) and 5 (b), and its surface is
microporous as shown in FIG. 5 (c). Is covered with a continuous cylindrical rubber or felt 23.
Further, the hollow portion of the roller 21 is constantly sucked and depressurized by, for
example, a vacuum pump 24. The moisture content can be adjusted to 40 to 50% by attaching
one or more dewatering rollers 21. Mao. When the width of the dewatering roller 21 is about
10% more than the width of the sheet 18, the dewatering effect of the dewatering roller 21
appears best. As another method of simply adjusting the moisture content, the moisture can also
be regulated by passing the impregnated sheet into a dryer.
However, in this case, the variation in the moisture content of the sheet 18 is somewhat used as
compared with the case of the suction roller. FIG. 6 shows a cross section of a molding die 25 for
obtaining the above-mentioned center cap used in the present invention. The molding die 25 has
a 5-hemispherical portion at the center, and the outer peripheral portion of the central white
portion is provided with a gap so that the sheet 18 is not drawn into the central white portion
more than necessary during press molding. Also, by changing the shape of this molding die to,
for example, the shape of a small-diameter toyer diaphragm, dome-shaped diaphragm, coneshaped diaphragm, etc., other speaker diaphragm members can be easily and identically shaped.
Can produce different color tones. Furthermore, the occurrence of wrinkles and cracks on the
surface of the vibrating member obtained by finely adjusting the moisture of the sheet stock
containing the microfibers of the thermoplastic resin is prevented, and the yield is improved and
the quality is stabilized. Things can be obtained in large quantities. Next, the conditions in the
case of producing a center cap having a diameter of 20 mm and a height of 6 mm as an example
are shown in Table 1. The mold position is 15mm from the center of the central white area (1.5
times the radius of the center cap) and its height is 0,7 mm (0.12 times the radius of the center
cap) ). The center cap obtained under the conditions in Table 1 has no problem in appearance,
and does not deform to an environmental test at 100 ░ C. for 24 hours or an environmental test
at 45 ░ C., 95% RH for 96 hours And had sufficient waterproofness. Effects of the Invention As
described above, according to the present invention, since the sheet-like stock mainly containing
pulp and containing the microfibers of the thermoplastic resin is press-formed only by the
forming die, the same one can be obtained only by changing the forming die. Various
loudspeaker vibrating members can be obtained from the stock. In addition, the process is
simplified and the process can be automated easily because the process can be continuously
performed. Furthermore, it is possible to easily obtain different color tones because it is possible
to impregnate the sheet stock at the raw material stage without being influenced by the addition
of the dye and to impregnate the water simultaneously with the second press, as in the prior art.
This reduces the number of processes, such as eliminating the need for cleaning the machine.
Therefore, since the material mainly composed of wood pulp fiber can be continuously formed,
and the operation of switching the raw materials different in color tone can be easily performed,
the working time of the manufacturing process of the speaker sheet and the J moving member is
greatly shortened. Ru. In addition, sufficient waterproofness can be imparted to the paper-made
vibration member obtained by using the sizing agent in combination in the impregnation step,
and the speaker paper Fi moving member such as a center cap and the like with stable quality
can be obtained. .
Brief description of the drawings
FIG. 1 is a partial cross-sectional view of the speaker, and FIG. 2 (a> (b) and (C) are explanatory
views showing the manufacturing steps of the paper-made member of the conventional speaker.
5 (a) and 5 (c) are sectional views showing a dewatering roller of an apparatus for carrying out
the present invention, and FIG. 5 (b) is a sectional view of the dewatering roller. FIG. 6 is a partial
cutaway side view and FIG. 6 is a cross-sectional view of a mold for obtaining the center
clearance of the apparatus embodying the invention.
Explanation of symbols of main parts 1 ..... Magnetic gap 2 ..... Voice coil bobbin 3 ..... Cone 4 .....
Center cap 5 ..... Damper 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и ... и и Suspension 12 containing minute m of thermoplastic resin и и и и
и Paper making tank и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 15 и и и и и и и и
и и и и и и и и и и и и и и ? Dewatering roller 22 Dewatering hole 23 Felt or porous rubber 24 Vacuum
Pump 25 ...... molding die 26 ...... cutting die
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