JP4286673B2 - Corn edge material - Google Patents

Description

  The present invention relates to a material (cone edge material) used for an edge portion of a speaker cone, and in particular, to maintain a good shape immediately after manufacture for a long period of time without impairing sound quality. It relates to the above material.

The edge portion of the speaker is indicated by reference numeral 1 in FIG. 1 (A) and serves to attach a cone portion 2 for amplifying sound to the casing 3 of the speaker. As a material constituting the edge portion 1, Conventionally, cotton cloth impregnated with a phenolic resin has been widely used in order to provide shape retention.
This phenolic resin-impregnated cotton fabric is formed into an edge shape by press molding.

By the way, although phenol resin makes mold separation | deterioration defect in the said press molding and makes a metal mold | die dirty, sufficient shape-retaining property cannot be ensured unless phenol resin is used.
In addition, the above-described phenolic resin-impregnated cotton cloth is used for the edge portion described above, and when it resonates with the vibration of the cone portion and repeats vibration, a dent 11 (commonly called Ekbo) as shown in FIG. appear.

  In order to suppress the dent 11, it is conceivable to give the edge portion 1 a certain degree of flexibility. However, in the phenol resin-impregnated cotton cloth, the hardness required for the edge material is set to the concentration of the phenol resin. In order to adjust and secure, it is extremely difficult to have both the hardness essential for the edge material and the flexibility for suppressing the dents.

A rubberized cloth is also known as an edge material having a certain degree of flexibility for suppressing the dent 11 and a certain degree of hardness required for the edge portion 1.
However, the rubberized cloth uses a rubber-based adhesive to secure the adhesion between the rubber layer and the fabric when forming the rubber layer on the fabric, and after the rubber layer is formed, the adhesion is performed. It is necessary to vulcanize including the agent layer, and this vulcanization tends to harden the texture of the entire material.
The hardness of the texture not only lowers the commercial value of the edge material, but also slightly changes the sound quality at the edge portion 1 and may reduce the effect of suppressing the dent 11 described above.

It is most preferable that the edge portion 1 does not resonate with the cone portion 2. That is, when the edge portion 1 resonates, the sound at the cone portion 2 changes. Therefore, in order to utilize the sound of the cone part 2 as it is, it is ideal that the edge part 1 does not resonate.
In order to stop the resonance of the edge portion 1, the edge portion 1 may be made of a soft material. However, if the material is too soft, the shape retaining property necessary for the edge portion 1 cannot be obtained.
In order to ensure this shape retention, when using a rubberized cloth for the conventional edge material, it is necessary to vulcanize the rubber layer and the rubber adhesive layer. I had to be.

  In consideration of the above-mentioned points, the present invention minimizes the resonance with the cone portion 2 as much as possible, and does not generate the dent 11 even if the vibration is resonated and repeats vibration, and the texture is hardened by making the vulcanized portion small. An object of the present invention is to provide a cone edge material that can suppress the manufacturing process and can complete the manufacture of the edge portion by a simple process.

In order to achieve the above object, the present invention uses a polyester crimped yarn having an elongation rate of 2 to 15% and an elongation recovery rate of 60 to 100% in place of the above cotton fabric, The gist of the present invention is a cone edge material characterized in that a cloth is used as a base material and a rubber layer is formed on the cloth via a rubber adhesive layer . At this time, the rubber-based adhesive layer is entirely coated or dot-coated, and in the case of the entire surface coating, the adhesive is preferably unvulcanized.

That is, in the present invention, the following functions and effects can be obtained by replacing the conventional cotton fabric with the fibrous material constituting the base material by using a polyester crimped yarn.
(1) Due to the inherent thermoplastic properties of polyester, which is the raw material for crimped yarn, the same properties as conventional edge materials using phenolic resins (ease of processing and moisture resistance), without using phenolic resins , Shape retention, etc.) can be obtained.
(2) The crimped yarn allows the base material itself to have good stretchability, and even if it resonates with the cone portion and repeats vibration, the generation of dents can be suppressed satisfactorily.
(3) Since the adhesive layer can be made into an unvulcanized rubber adhesive by using a base material made of the above-described thermoplastic polyester crimped yarn, the hardness of the texture is reduced, and The resonance at the edge portion is reduced, and the speaker can cope with higher sound pressure.

According to the present invention, the following effects can be achieved.
(1) A material for corn edge that is easy to process and has characteristics such as moisture resistance and expansion and contraction can be obtained.
(2) Not only can the resonance state of the cone portion be maintained as it is, but also the occurrence of dents can be satisfactorily suppressed even when the cone portion resonates and repeats vibration.
(3) Since the adhesive layer between the base material and the rubber layer does not need rubber elasticity, it is not necessary to vulcanize the adhesive layer, and the texture of the edge material does not become hard.
(4) When a rubber-based adhesive is used, it becomes an unvulcanized rubber-based adhesive layer, and the unvulcanized rubber-based adhesive has good adhesiveness. It can be easily bonded to the cone and other speaker structures, and the edge can be easily attached.
(5) The hardness of the texture can be reduced, the resonance at the edge portion can be reduced, and the change in sound can be eliminated as much as possible.

The polyester crimped yarn in the present invention is, for example, a polyester fiber false twisted, then subjected to heat treatment, acid treatment or the like to be crimped and twisted into a yarn, or a polyester fiber twisted. After being made into a yarn, those that have been crimped by being hardened or steamed, or those obtained by various other production methods can be used.
Such a polyester crimped yarn is easy to process because the polyester is a thermoplastic resin, and is excellent in moisture resistance.
In the present invention, since a polyester crimped yarn having such characteristics is used, it is possible to provide a long-life edge material that has excellent durability and works well over a long period of time.

  In the present invention, the crimpability (stretchability) refers to a stretched state (stretched state) by applying a tensile force to a yarn in a state where no force is applied (steady state). By removing the tensile force from the yarn, it can be restored to its original steady state, and by adding and removing this tensile force, it can repeat the steady state and the stretched state. As for the degree, it is suitable that the stretch rate is 2 to 15% and the stretch recovery rate is about 60 to 100% based on the JIS L 1096 A method for the base material made of the crimped yarn.

  If it is a crimped yarn with the above-mentioned degree of crimping of the base material, the elasticity necessary for the edge material (stretchability that can expand and contract following this resonance without changing the resonance state of the cone part) ) Can be held.

  The base material in the present invention is a woven fabric, a nonwoven fabric, a knitted fabric or the like created from the above-described polyester crimped yarn, and the weaving method, the knitting method, etc. of such a fabric are not particularly limited, It should just be created so that it may have sex.

Moreover, if the thickness of the polyester silk thread for creating the stretchable base material is too thick, the thickness of the base material for the edge material becomes too large and the application is limited (the diameter of the speaker is large, Therefore, the edge portion can be used only for a large size). If it is too thin, the mechanical strength will decrease, or if it is thinned without reducing the mechanical strength, it will be a high cost yarn. Therefore, in the present invention, it is preferable to use a crimped yarn having a thickness of about 20 to 1000 denier, preferably about 50 to 150 denier.
With this thickness, the thickness of the stretchable base material can be set to about 0.1 to 0.5 mm, and it is suitable for speakers with various diameters and edge portions corresponding to required quality. Can be imparted with excellent elasticity.

The rubber layer formed on the base material is formed using the same rubber as the rubber used for the rubberized cloth as a conventional edge material.
Specifically, butyl rubber (BR), nitrile rubber (NR), urethane rubber (UR), isoprene rubber (IR), chloroprene rubber (CR), chlorosulfonated rubber (CSM), ethylene propylene rubber (EPDM), styrene Rubber such as rubber (SBR) is used.

  Various additives such as softeners, fillers, processing aids, lubricants and the like may be added to the rubber, and in some cases, foaming agents such as microcapsules may be added. .

When a foaming agent such as a microcapsule is added, the rubber layer can be made foamable by heating and foaming (expanding) in a vulcanization process described later.
The foam rubber layer not only reduces the weight of the edge material of the present invention and improves the sound quality of the speaker using the edge material, but also improves the handleability of the edge material, and consequently the edge material. Improve the handling of speakers with an edge.

Examples of the microcapsules that can be used in the present invention include those in which a volatile agent such as hydrocarbon is encapsulated in a synthetic resin shell such as an acrylonitrile copolymer or a vinylidene chloride copolymer. .
If these synthetic resin shells and volatile chemicals are combined, the shell will have good flexibility in the vulcanization process described later, the volatile chemicals will volatilize easily, and the vapor pressure of the volatile chemicals will provide flexibility. The expanded shell is expanded, and the expanded shell is solidified in an expanded form in the standing cooling or active cooling process after the vulcanization process, so that the rubber layer can be in a foamed state.

The blending ratio of the microcapsules is not particularly limited, and an appropriate one is selected depending on the desired degree of foaming of the rubber layer. There is a concern of peeling off, and if it is too small, the technical significance of blending the microcapsules is not expressed.
Therefore, in this invention, it is suitable to set it as about 0.1 to 0.5 weight% in the rubber composition whole quantity which forms a rubber layer.

For the formation of the rubber layer, for example, a forming method similar to that of a conventional rubberized cloth such as a topping method or a coating method is employed.
In the case of the topping method, for example, a rubber-based adhesive layer is formed on a base material, and a rubber layer made of the above rubber composition is formed thereon, and a dusting layer by dusting such as starch powder as an antiblocking agent May be formed.
In the case of the coating method, for example, a rubber-based adhesive layer is formed on a substrate, a rubber intermediate layer made of the rubber composition is formed thereon, and a rubber top layer made of the rubber composition is further formed thereon. May be formed.

  The rubber-based adhesive layer in the topping method and coating method may be a normal rubber-based adhesive used in a normal rubberized cloth, etc., but has a composition that is not vulcanized in the vulcanization step described later. Is preferably used.

The thickness of each layer in the topping method and the coating method is not particularly limited and may be appropriately determined according to the diameter of the speaker to be used. For example, a speaker used in a passenger car or the like (diameter is about 5 to 18 cm). ), The following thickness can be used as a guide.
In the topping method, the rubber adhesive layer is about 0.02 to 0.1 mm, the rubber layer is about 0.08 to 0.2 mm, and the amount of dusting is about 10 to 100 g / m ^2. A suitable adhesive layer is about 0.02 to 0.08 mm, an intermediate rubber layer is about 0.02 to 0.08 mm, and a top rubber layer is about 0.02 to 0.08 mm.

In both the topping method and the coating method, after all the layers are formed, the rubber layer (in the case of the coating method, both the rubber intermediate layer and the rubber top layer) are vulcanized. The conditions for vulcanization at this time may be the same as in the case of a conventional rubberized cloth, but in the present invention, as described above, a material having crimpability by a crimped yarn made of thermoplastic polyester is used. Therefore, only the rubber layer may be vulcanized or may remain unvulcanized.
If the rubber layer remains unvulcanized, the edge portion of the material of the present invention and the speaker cone paper (the material is polypropylene, paper, fiber composite, etc.) or the speaker support member (speaker edge It is not necessary to use an adhesive separately when bonding to a member that supports the speaker outside and can be bonded by applying heat.
In this way, by thermally bonding the edge portion and the cone paper, these can be fixed without using a hard adhesive layer, so that the function of the speaker can be further improved.

The rubber-based adhesive may or may not be vulcanized, and is preferably not vulcanized using a rubber-based adhesive that does not contain a vulcanizing agent.
Also, the rubber adhesive can be partially applied onto the substrate by dot coating, etc., and the rubber layer and the substrate layer can be partially bonded. In this case, the rubber adhesive containing the vulcanizing agent The rubber layer may be vulcanized using an agent, or it may not be vulcanized using a rubber-based adhesive that does not contain a vulcanizing agent. Absent.
The conditions for vulcanization are preferably a temperature of 130 to 160 ° C. and a time of about 10 to 20 hours.

1
After vulcanization as described above, it may be cut into a desired edge portion shape and attached to the edge portion of the speaker.

[Examples 1-10, Comparative Examples 1-2]
Based on polyester crimped yarn with a thickness of 75, 100, 150 denier, a plain weave fabric using a spun yarn made of cotton fiber with a thickness of 75 denier (using the product name “# 111” by ITOCHU), A rubber layer made of the following rubber composition having a thickness of 0.1 to 0.2 mm is formed on these four types of base materials via a rubber adhesive (co-glue in which butyl rubber is dissolved in a solvent) layer. A sheet was formed by powdering of 1 g / m ² .
In addition, as a method for forming the adhesive layer, a dot coat using a gravure roll on the entire surface of the substrate and a gravure roll on the surface of the substrate (a state where the adhesive is applied to about 30% of the surface area) Two types of dot coats for applying an adhesive were used.

(Rubber composition)
Butyl rubber 100 parts by weight Microcapsule 0.3 part by weight (Matsumoto Yushi Co., Ltd., trade name “Microsphere”)

  The sheet obtained as described above is used as an edge material, and an edge portion of a speaker to be mounted on a passenger car is configured, and a load applied when CD music is played from the speaker while the passenger car is moving to the edge portion. Was simulated as follows.

As shown in FIG. 2, 20 ° C. × 1H standing → 2H rising to 60 ° C. → 60 ° C. × 6H standing → 2H dropping to 40 ° C. → 40 ° C. × 4H standing → 2H dropping to −20 ° C. → −20 The temperature was raised to 20 ° C. at 1 ° C. for 5 cycles.
After the above cycle, CD music was played for 1 hour, and it was observed whether or not a dent was generated. The results are shown in Tables 1 to 3.

The symbols in Table 1 have the following meanings.
○: No dent is generated and the state is kept in good condition. X: A dent is generated and not only the appearance is deteriorated but also the sound quality is deteriorated.

  As is apparent from Tables 1 to 3, according to the edge material of the present invention, that is, a material made of polyester crimped yarn, a crimped yarn made of cotton (Comparative Example 1) or polyester However, compared to the case of using a material made of non-crimped yarn (Comparative Example 2), there is no dent, and the cone has excellent sound quality as well as appearance over a long period of time. An edge portion can be provided.

It is a figure for demonstrating the positional relationship of the speaker which should attach the raw material for cone edges of this invention, (A) is sectional drawing of the whole, (B) is a dent in the edge part comprised with the material for conventional cone edges. It is a figure for demonstrating the condition when it generate | occur | produces. It is a figure explaining the duty cycle for the simulation performed in the Example and comparative example of the present invention.

Explanation of symbols

1 Edge 2 Cone 3 Casing

Claims (3)

Percentage elongation was at 2-15%, corn edges, characterized in that the elongation recovery ratio to a substrate consisting of condensed yarn wound made 60% to 100% of polyester, formed by laminating a rubber layer via the rubber adhesive layer Material for. 2. The cone edge material according to claim 1, wherein the rubber adhesive layer is dot-coated. 2. The cone edge material according to claim 1, wherein the rubber adhesive layer is coated on the entire surface, and the rubber adhesive is unvulcanized.

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