JP2005236498A - Manufacturing method of speaker diaphragm and production facility of manufacturing the diaphragm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a speaker diaphragm used for various acoustic devices with a high degree of freedom of characteristic and sound quality adjustment, ensured moisture-proof and water-proof reliability and strength, excellent outward appearance and high productivity. <P>SOLUTION: The manufacturing method of the speaker diaphragm is a method for manufacturing the speaker diaphragm by composing a material, resulting from wet-mixing a fibrous resin 1 and a filler 2 and almost dehydrating the mixture in advance, with a granule resin 8 pulverized in other process and injection molding the composite material. Thus, the manufacturing method of the speaker diaphragm wherein features of the resin and pulp being the filler are compatible and the production facility of manufacturing the diaphragm can be realized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a diaphragm for a speaker used in various types of audio equipment and production equipment therefor.

  Conventional loudspeaker diaphragms are mainly a paper diaphragm formed by making a pulp material and a resin diaphragm formed by injection molding a resin material.

  The properties of paper diaphragms can be varied within a large range and in detail, so it has the advantage of fine tuning of speaker characteristics and sound quality, but on the other hand, moisture resistance, water resistance reliability and strength peculiar to paper Have the disadvantage of being inferior.

  In addition, the production has the disadvantage that it cannot be obtained unless a very large number of processes such as paper making are required, and that the stability of dimensions and quality is poor.

  On the other hand, with resin diaphragms, moisture resistance, water resistance reliability and strength can be ensured, and the appearance can be improved, while productivity improvement and quality stabilization can be realized, but on the other hand, it is the uniqueness of the resin that is the fate of the resin Since only physical property values can be secured, there is a disadvantage that the adjustment range of the characteristics and sound quality as a speaker is very narrow.

  Then, while utilizing the characteristics of each of these diaphragms, the speaker is configured to be used properly.

  A conventional resin diaphragm manufacturing method and production facility will be described with reference to FIG. FIG. 2 is a process chart showing a manufacturing method and production equipment for a resin-made speaker diaphragm by conventional injection molding. As shown in FIG. 2, a master batch 23 produced by dry blending a resin 21 such as polypropylene (hereinafter referred to as PP) with PP 22 containing a reinforcing material such as mica is pelletized by a pellet molding machine 24. Then, this master batch pellet 25 is put into an injection molding machine 26.

  In the injection molding machine 26, the charged master batch pellets 25 are heated and melted by a heating process, and are injected into a vibration mold 27 by an extruder. Then, the PP resin injected into the molding die 27 is cooled and solidified and taken out from the molding die 27. Through the above injection molding process, the resin diaphragm 28 typified by PP or the like is manufactured.

  In general, a single material such as PP is often used as the type of resin material by injection molding. In addition, for the purpose of adjusting physical property values as a diaphragm, that is, adjusting characteristics and sound quality as a speaker, there is a blend type in which different kinds of resins are mixed. In this blend type, as a manufacturing method, necessary types of resin pellets were pulverized by a pulverizer, the blending ratio was set, and mixed by dry blending.

As a prior art document related to the invention of this application, for example, Patent Document 1 is known.
JP-A-1-248900

  With respect to recent electronic equipment such as audio equipment and video equipment, the performance has been dramatically improved as compared with the prior art due to remarkable progress in digital technology. Therefore, due to the improvement in performance of the electronic devices described above, there is a strong demand from the market to improve the performance of speakers used in these electronic devices.

  On the other hand, for a speaker whose performance is strongly demanded by the market, it is indispensable to improve the performance of a diaphragm that occupies a large weight that determines the sound quality among the components of the speaker. In recent years, resin diaphragms have become very popular from the viewpoints of quality stabilization, water resistance reliability, and design diversity.

  However, this resin diaphragm can adjust the characteristics and sound quality as a speaker only within the range of physical properties of the resin, and can only produce a uniform sound. Therefore, it was not possible to create various sounds and fine adjustments that meet market requirements. Therefore, even for resin diaphragms, it is necessary to obtain physical property values that can finely set the physical properties of diaphragms, such as paper diaphragms, and increase the degree of freedom in adjusting the characteristics and sound quality of speakers. Met.

  In order to realize the above, mixing of resin and pulp, which is a raw material of paper, was being tried. However, in the manufacturing method using the current production equipment, that is, the mixing method using dry blending, mixing of different types of resins is possible, but for mixing the resin and pulp, the pulp does not fit well in the resin, The problem is that desired characteristics and sound quality cannot be achieved.

  An object of the present invention is to solve the above-mentioned problems and to provide an excellent speaker diaphragm in which the familiarity between resin and paper is improved and both good characteristics are compatible.

  That is, to provide a speaker diaphragm that has a high degree of freedom in adjustment of characteristics and sound quality as a speaker, can secure moisture resistance, water resistance reliability and strength, and has an excellent appearance, stably with high productivity. It is intended.

  Accordingly, the present invention provides an excellent speaker diaphragm manufacturing method and production equipment for achieving this object.

  In order to solve the above-mentioned problems, the present invention is a method for manufacturing a speaker diaphragm by injection molding formed from at least two kinds of materials, that is, a resin and a filler, and includes a fibrous resin and a filler in advance. A diaphragm for speakers formed by recombining a primary composite material that has been substantially dehydrated by wet mixing and a granular resin pulverized in a separate process to obtain a secondary composite material, and injection molding the secondary composite material This is a manufacturing method.

  By this manufacturing method, the secondary composite is prepared by first compounding the fibrous resin and the filler by wet mixing in the previous process, and preparing the granular resin pulverized in another process and recombining them. By providing a process, the moisture and the resin can be replaced to improve the familiarity between the resin and the filler, and the respective good features can be extracted.

  In the manufacturing method of the speaker diaphragm of the present invention, a fibrous resin and a filler are first combined by wet mixing in a previous step, and a granular resin pulverized in another step is prepared. This is a manufacturing method provided with a secondary compounding step for recombination. By adopting this production method, moisture by primary mixing wet mixing can be evaporated in the secondary combining step, and at the same time, the resin can be dissolved to improve the entanglement with the filler and improve the familiarity.

  In other words, the manufacturing method is such that the moisture and the resin are replaced, the familiarity between the resin and the filler is improved, and the respective characteristics of the resin and the filler are extracted. Therefore, a speaker using this diaphragm has a large degree of freedom in adjusting its characteristics and sound quality, can secure moisture resistance, water resistance reliability and strength, and can have an excellent appearance.

  Conventionally, physical properties of a paper diaphragm that could not be obtained without going through a long papermaking process can be stably provided with high productivity according to the production method and production equipment.

  As described above, the present invention can provide an excellent speaker diaphragm manufacturing method and production equipment that have both the characteristics of the resin and the filler, and its industrial value is very large. .

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
Hereinafter, the invention according to the first to seventh aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a process chart showing a method for manufacturing a diaphragm according to an embodiment of the present invention.

  With reference to FIG. In step A1, PP1 that is a fibrous resin material and pulp 2 that is a filler are previously mixed and sufficiently mixed by a wet mixer 3 while containing a large amount of moisture. Then, in step A2, this is put into the dehydrator 5 and substantially dehydrated while containing an appropriate amount of water, and the primary composite material 4 is obtained. At this time, kraft pulp (NUKP) is used for the pulp 2 which is a filler.

  Moreover, in another B1 process, the PP pellet 6 which is a resin material is grind | pulverized with the grinder 7, and the granular PP resin 8 is obtained.

  Next, in the step C1, the primary composite material 4 obtained in the steps A1 and A2 and the granular PP resin 8 obtained in the step B1 are combined again by the mixer 9. In this C1 step, by replacing the moisture contained in the primary composite material 4 at the time of wet mixing obtained in at least the A1 and A2 steps with the fibrous resin and the granular PP resin 8 obtained in the B1 step, It is compounded by improving each other's familiarity.

  Here, a preferable method as this substitution step is a method of combining by heat drying. In this method, the primary composite material 4 and the granular PP resin 8 are put into a mixer 9 and dried by heating to evaporate the remaining water, and at the same time, the fibrous resin and the granular PP resin 8 are heated. By dissolving and substituting the moisture and the PP resin, the entanglement between the PP and the pulp can be improved, the familiarity can be improved, and the composite can be efficiently combined. By this step, the secondary composite material 10 in which the familiarity between PP and pulp is improved is obtained.

  Then, the secondary composite material 10 is injected into the inside of the vibration mold 13 while applying heat by the injection molding machine 14 to obtain the vibration plate 15. Finally, the diaphragm 15 is cooled and solidified and taken out from the mold 13.

  Through the above steps, a manufacturing method for obtaining the diaphragm 15 in which familiarity between PP and pulp is improved can be constructed.

  Moreover, in this manufacturing method, in order to make the familiarity of PP and pulp more complete, before the injection molding, the secondary composite material 10 is pelletized again by the pellet molding machine 11 by providing the C2 step. It can also be set as the manufacturing method which obtains the pellet product 12 of the next composite material 10, and throws into the injection molding machine 14. FIG.

  Furthermore, a method for manufacturing a speaker diaphragm may be constructed by adding the mixing step D1 of the reinforcing material 16 such as mica or the dilution resin 17 at the time of recombination in the C1 step or afterwards.

  With this manufacturing method, further fine adjustment of the physical property value of the diaphragm can be performed. In this case, if the reinforcing material 16 such as mica is mixed, the rigidity of the diaphragm can be improved, and the speaker characteristics and sound quality corresponding to this can be established. In addition, if the diluted resin 17 is mixed, the characteristics of the diaphragm resin can be greatly reflected, and the speaker characteristics and sound quality can be established accordingly.

  In addition, as described above, by using pulp as the filler, it is possible to impart a property closer to that of a paper diaphragm while being a resin diaphragm. And by using PP for resin, it is cheap and can establish high productivity.

  By this manufacturing method, the familiarity between the resin and the filler can be improved, and the respective good features can be extracted. Therefore, a speaker using this diaphragm has a large degree of freedom in adjusting its characteristics and sound quality, can secure moisture resistance, water resistance reliability and strength, and can have an excellent appearance.

  Conventionally, physical properties of a paper diaphragm that could not be obtained without going through a long paper making process can be stably provided with high productivity.

(Embodiment 2)
Hereinafter, the second and second embodiments of the present invention will be described.

  The drawings will be described with reference to FIG. 1 used in the first embodiment.

  The invention according to claim 8 of the present invention is a production facility by injection molding of a speaker diaphragm.

  As shown in FIG. 1, a wet mixer 3 which is a wet mixing means of at least two kinds of materials of resin and filler, a dehydrator 5 which is a dehydrating means, and a pulverizer 7 which is a resin pulverizing means, A speaker diaphragm production facility 20 is configured by including a mixer 9 as a compounding means, a molding die 13 and an injection molding machine 14 as an injection molding means.

  With this configuration, the fibrous resin and filler can be kneaded by wet mixing, compounded, pulverized to obtain a granular resin, and compounded in replacement of moisture and resin. By improving the entanglement with the material and improving the familiarity, it is possible to provide a production facility that can draw out each good feature.

  Furthermore, the invention described in claim 9 of the present invention is a resin and reinforcing material 16 which is a mixing means of the production facility 20 described in claim 8 and a resin and a resin-based material or diluted resin containing a reinforcing material. And a mixer 18 with a dilute resin 17 to constitute a speaker diaphragm production facility.

  With this configuration, it is possible to provide a production facility that can further finely adjust the physical property value of the diaphragm. In other words, the rigidity of the diaphragm can be improved when a resin-based material including a reinforcing material is additionally mixed, and conversely, when the diluted resin is additionally mixed, the resin physical properties of the diaphragm are further increased. The physical property value can be adjusted. Therefore, it is possible to improve the familiarity between the resin and the filler, draw out the good characteristics of each, and make a production facility capable of finely adjusting the physical property value of the diaphragm.

  Since the method for manufacturing a speaker diaphragm according to the present invention can produce a diaphragm having both the characteristics of resin and pulp as a filler, it is possible to obtain various types of acoustics for which both the characteristics of the resin diaphragm and the paper diaphragm are desired. The present invention can be applied to an apparatus such as a manufacturing method or a production facility for a speaker diaphragm used in equipment.

Process chart which shows the manufacturing method of the diaphragm for speakers in one embodiment of the present invention Process chart showing conventional method for manufacturing speaker diaphragm

Explanation of symbols

1 Fibrous PP
2 Pulp 3 Wet mixer 4 Primary composite 5 Dehydrator 6 PP pellet 7 Crusher 8 Granular PP
9 Mixer 10 Secondary composite material 11 Pellet molding machine 12 PP pellet 13 Mold 14 Injection molding machine 15 Diaphragm 16 Reinforcement material 17 Diluted resin 18 Mixer 20 Production equipment

Claims (9)

A method for manufacturing a speaker diaphragm by injection molding formed from at least two kinds of materials of a resin and a filler, wherein a primary composite material obtained by substantially wet-mixing a fibrous resin and a filler in advance And a granular resin pulverized in a separate step to obtain a secondary composite material, and a method for manufacturing a speaker diaphragm by injection molding the secondary composite material. The method for manufacturing a speaker diaphragm according to claim 1, wherein the step of obtaining the secondary composite material includes a step of replacing at least moisture and resin. The method for manufacturing a speaker diaphragm according to claim 2, wherein the replacement step of moisture and resin is granulated by heat drying. The method for manufacturing a speaker diaphragm according to any one of claims 1 to 3, further comprising a step of re-pelletizing the secondary composite material before injection molding. The method for manufacturing a speaker diaphragm according to any one of claims 1 to 4, wherein a step of mixing a reinforcing material or a diluted resin is added during or after recombination. The method for manufacturing a speaker diaphragm according to any one of claims 1 to 5, wherein the filler is pulp. The method for manufacturing a speaker diaphragm according to any one of claims 1 to 6, wherein the resin is polypropylene. This is a production facility for injection molding of a diaphragm for a speaker, which is pulverized by primary compounding means by wet mixing of at least two kinds of materials of fibrous resin and filler, this dehydrating means, and resin pulverizing means. A speaker diaphragm production facility comprising means for recombining with granular resin, a molding die, and injection molding means. 9. A loudspeaker diaphragm production facility comprising the production facility according to claim 8, and a mixing means of a resin and a resin-based material including a reinforcing material or a diluted resin.

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