JP6570988B2 - Method for manufacturing film for speaker diaphragm - Google Patents

Description

  The present invention relates to a method for producing a lightweight speaker diaphragm film excellent in mechanical characteristics, sound quality characteristics, heat resistance, and the like.

  Various electronic devices including a mobile phone, a smartphone, a portable music device, a portable game machine, a tablet personal computer, and the like incorporate a small speaker that reproduces sound. The diaphragm that vibrates this speaker to generate sound waves is (1) metal foil, (2) natural resin paper, woven fabric, or non-woven fabric, and (3) synthetic resin film, woven fabric, or non-woven fabric. Is formed.

  When the diaphragm is a film made of (3) synthetic resin, a polyolefin resin such as polyethylene (PE) resin, polypropylene (PP) resin, polyethylene terephthalate (PET) resin, polyethylene naphthalate (PEN) resin, etc. Synthetic resin films made of polyester resins, polyphenylene sulfide (PPS) resins, and the like have been proposed and used.

  By the way, in recent years, more and more functions and performance are being improved in speakers. Therefore, the required characteristics for the diaphragm of the speaker are becoming increasingly severe. The required characteristics required for this diaphragm are light weight (low density or specific gravity), high loss tangent (or internal loss, also called tan δ), and moderate rigidity (Young's modulus, elastic modulus). In addition, it has excellent thickness accuracy, high strength, and excellent durability. In addition to these characteristics, heat resistance, moisture resistance, and water resistance are also included. Moreover, it is mention | raise | lifted that the film for diaphragms is excellent in the secondary workability (press molding, vacuum forming, pressure forming, etc.) to a diaphragm.

JP-A-60-139098 JP 58-222699 A JP 2007-43597 A

However, when the diaphragm is made of (1) metal foil, it is excellent in moisture resistance, water resistance, and heat resistance, but has a high density and rigidity, so that the minimum resonance frequency (f ₀ ) is high, and the reproduction characteristic of bass is insufficient. It becomes. Moreover, since the loss tangent is low, a problem occurs in sound quality. In addition, when the diaphragm is (2) natural resin paper, woven fabric, or non-woven fabric, the density is low and the weight is low, but the rigidity is small, so there is a problem in reproduction in the high frequency region, and the loss tangent is small. Problems with sound quality occur. In addition, there is a problem in moisture resistance, water resistance, and heat resistance, and the manufacturing process of the speaker is complicated.

In addition, when the diaphragm is a film made of (3) synthetic resin, specifically a film made of polyolefin resin, it is lightweight and has a large loss tangent, and is excellent in moisture resistance, water resistance and moldability, but has low rigidity, Problems arise in heat resistance. Further, in the case of a film made of polyethylene terephthalate resin, it is excellent in rigidity and heat resistance as compared with a polyolefin resin film, but the loss tangent is small and the sound quality is insufficient. Further, since the density is as large as 1.4 g / cm ³ , it is not possible to reduce the weight. Furthermore, since the diaphragm made of a film made of polyethylene terephthalate resin is deformed at a temperature of around 70 ° C., the heat resistance is insufficient.

In addition, in the case of a film made of polyethylene naphthalate resin, it has high strength, excellent durability, very large loss tangent, and excellent sound quality characteristics. It is necessary to perform orientation. However, when the film is highly oriented, the rigidity (elastic modulus) of the film is increased, so that the lowest resonance frequency (f ₀ ) is increased and the bass reproduction characteristics are insufficient. Further, when the orientation is high, secondary workability such as press molding, vacuum forming, or pressure forming of the film is lowered. In addition, the density is as large as 1.4 g / cm ^3, and weight reduction cannot be expected.

In the case of a film made of polyphenyl sulfide resin, it has high strength, excellent durability, and excellent heat resistance. However, in order to bring out these properties, it needs to be oriented by advanced biaxial stretching. However, when the orientation is high, the lowest resonance frequency (f ₀ ) is increased as described above, so that the low-frequency sound reproduction characteristics are insufficient, and secondary processing such as press molding, vacuum molding, or pressure forming of a film is performed. The properties will also be reduced. In the case of a film made of polyphenylene sulfide resin, the loss tangent is low, causing a problem in sound quality. In addition, since the density is as large as 1.4 g / cm ³ , there is a possibility that the weight reduction may be hindered.

  In view of the above, a film made of polyetherimide (PEI) resin or a film made of polyetheretherketone (PEEK) resin has been proposed and used as a diaphragm film (Patent Documents 1 and 2). 3).

  Polyetherimide resin is lighter in density and lighter than polyethylene terephthalate resin, polyethylene naphthalate resin, and polyphenylene sulfide resin. In addition, since the polyetherimide resin is an amorphous resin, the diaphragm is molded in comparison with a film made of a crystalline resin such as polyethylene terephthalate resin, polyethylene naphthalate resin, or polyphenylene sulfide resin. Secondary formability (press molding, pressure forming, vacuum forming, etc.) is also excellent. Furthermore, the polyetherimide resin film has a high loss tangent, so it has excellent sound quality characteristics. Speakers for various small electronic devices such as mobile phones, smartphones, portable music devices, portable game machines, and tablet personal computers have been used. Or, it is used for a diaphragm of a vehicle-mounted speaker.

  However, although a film made of polyetherimide resin can provide the above-described excellent characteristics, its strength is low, so that increasing the external output causes a problem in durability such as causing damage to the film.

  On the other hand, although the melting point of polyether ether ketone (PEEK) resin is as high as 320 to 360 ° C., since the glass transition point is relatively low as 140 to 150 ° C., the diaphragm obtained from the film made of polyether ether ketone resin is The heat generated in the voice coil may be deformed or damaged. In addition, since the loss tangent of the polyether ether ketone resin film is low, there is a problem in sound quality. Furthermore, since the polyether ether ketone resin is expensive, there is a possibility that the cost cannot be reduced.

  The present invention has been made in view of the above, and an object of the present invention is to provide a method of manufacturing a lightweight speaker diaphragm film having excellent mechanical characteristics, heat resistance, and sound quality characteristics at low cost.

  As a result of intensive studies aimed at solving the above-mentioned problems, the present inventor completed the present invention by paying attention to the fact that the polyether ether ketone resin and the polyetherimide resin exhibit good compatibility.

That is, in the present invention, in order to solve the above problems, a diaphragm film is extruded from a die of an extruder using a molding material composed of a polyether ether ketone resin and a polyetherimide resin, and this extrusion molding is performed. This is a manufacturing method for manufacturing a diaphragm film by winding the diaphragm film on a crimping roll, a cooling roll, and a winder, and sandwiching the diaphragm film between the crimping roll and the cooling roll. And
A polyetheretherketone resin having a repeating unit represented by the following chemical formula [Chemical Formula 1], a polyetherimide resin having a repeating unit represented by the following chemical formula [Chemical Formula 2], and having a glass transition point of 200 ° C. or higher; A molding material is prepared by melting and kneading a mixture comprising a melting point of a polyether ether ketone resin or a glass transition point of the polyetherimide resin to a temperature of 450 ° C., and a composition mass ratio of the molding material is changed to a polyether ether. 5-60 mass% ketone resin and 95-40 mass% polyetherimide resin,
The prepared molding material is continuously extruded into the diaphragm film of the speaker by a T die heated to a melting point of the polyether ether ketone resin of the extruder or a glass transition point of the polyetherimide resin to 450 ° C. shaped, interposed therebetween relative crystallinity of the diaphragm film by cooling between the extruded pressing roll which is adjusted diaphragm film to a temperature of 50 ° C. to 230 ° C. and the cooling roll 70 % Or less,
The characteristics of the diaphragm film after cooling are as follows: loss tangent at 20 ° C. is 0.0150 to 0.0310, tensile strength is 100 to 131 N / mm ² , tensile elastic modulus is 2000 to 3500 N / mm ² , and heat resistance is 175. It is characterized by having a specific gravity of 1.24 to 1.28 and a thickness of 2 to 150 μm.

In addition, a winder for the diaphragm film is installed downstream of the crimping roll, and a slit blade for forming a slit on the side of the diaphragm film is disposed between the crimping roll and the winder. A tension roll for applying tension to the diaphragm film can be rotatably supported between the slit blade and the winder .

  Here, the number of pressure-bonding rolls and cooling rolls in the claims can be increased or decreased as necessary. The heat resistance is preferably such that the first inflection point temperature of the storage elastic modulus is 175 ° C. or higher. Furthermore, the speaker according to the present invention is used in various acoustic devices and electronic devices including at least a mobile phone, a smartphone, a portable music device, a portable game machine, a tablet personal computer, and the like.

Since the film for a diaphragm after cooling in the present invention has a loss tangent of 0.0150 to 0.00310 , good sound quality characteristics can be obtained, and the tensile elastic modulus is 2000 to 3500 N / mm ^2, so that the reproduction frequency is The area can be enlarged. Further, since the mechanical properties (tensile strength is 100 N / mm ² ) and heat resistance (first inflection point temperature of storage elastic modulus) are 175 ° C. or higher, a speaker excellent in external output and durability can be obtained. Moreover, since specific gravity is 1.24-1.28 , weight reduction of a diaphragm can be anticipated. Furthermore, since the thickness of the diaphragm film is in the range of 2 to 150 μm, the mechanical properties of the diaphragm film can be remarkably lowered, and the molding accuracy can be prevented from being lowered.

According to the present invention, it is possible to obtain a lightweight and inexpensive speaker diaphragm film having excellent mechanical characteristics, heat resistance, and sound quality characteristics. In addition, the temperature during the preparation of the molding material and the extrusion with the T die is set to the melting point of the polyether ether ketone resin or the glass transition point of the polyetherimide resin to 450 ° C. The polyether ether ketone resin or the polyetherimide resin is not likely to be decomposed. Further, if the pressure-bonding roll and the cooling roll are adjusted to a temperature in the range of 50 to 230 ° C., the crystallinity of the diaphragm film can be adjusted, and the mechanical characteristics, heat resistance, and Adjustment of the next workability becomes easy.
In addition, since the relative crystallinity of the diaphragm film is 70% or less, when the diaphragm film is formed by a secondary processing method such as press molding, vacuum forming, or pressure forming, the secondary workability is reduced. There is no risk of inviting. Moreover, since the loss tangent of the diaphragm film is in the range of 0.0150 to 0.0310, good sound quality characteristics can be obtained. Moreover, since the tensile strength of the diaphragm film is in the range of 100 to 131 N / mm ² , there is no risk of tearing even if the external output of the diaphragm obtained by molding the diaphragm film is increased. Further, since the specific gravity is 1.24 to 1.28, it is possible to reduce the weight of the diaphragm. In addition, excellent moisture resistance, water resistance, light weight, and moldability can be obtained, and the thickness of the diaphragm film is 2 to 150 μm, so that the manufacturing process of the speaker can be prevented from becoming complicated. There is an effect.

  According to invention of Claim 2, since the slit blade for film cutting is arrange | positioned between a crimping | compression-bonding roll and a winder, it becomes possible to process a film for diaphragms easily to a predetermined size. .

It is a whole explanatory view showing typically an embodiment of a manufacturing method of a film for a diaphragm of a speaker concerning the present invention. It is a graph which shows the relationship between the 1st inflection point temperature and the storage elastic modulus in the Example of the manufacturing method of the film for speakers of the present invention.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. A manufacturing method of a speaker diaphragm film 1 according to the present embodiment includes a predetermined polyether ether ketone resin and a poly A molding material 2 composed of an etherimide resin was prepared by melt kneading, and the diaphragm film 1 was continuously extruded from the T die 13 of the melt extrusion molding machine 10 using this molding material 2, and this extrusion molding was performed. The diaphragm film 1 is wound around the crimping roll 16, the cooling roll 17, and the winding tube 19 in order, and the diaphragm film 1 is sandwiched between the crimping roll 16 and the cooling roll 17 to be cooled. The film for plate 1 is manufactured.

  The molding material 2 of the diaphragm film 1 has a polyether ether ketone resin having a repeating unit represented by the chemical formula [Chemical Formula 1] and a repeating unit represented by the chemical formula [Chemical Formula 2], and has a glass transition point. It is prepared by melt-kneading a mixture of a polyetherimide resin having a composition mass ratio of 5 to 60% by mass and a polyetherimide resin of 95 to 40% by mass.

  The molding material 2 includes polyimide resin such as polyimide (PI) resin and polyamideimide (PAI) resin, polyamide 6T (PA6T) resin, modified polyamide 6T (modified PA6T) resin, polyamide 9T (PA9T) resin, polyamide 10T ( PA10T) resin, polyamide 11T (PA11T) resin, polyamide 6 (PA6) resin, polyamide 66 (PA66) resin, polyamide 46 (PA46) resin and other polyamide resins, polyetherketone (PEK) resin, polyetherketoneketone (PEKK) ) Resin, polyether ether ketone ketone (PEEKK) resin, polyaryl ketone resin such as polyether ketone ether ketone ketone (PEKEKK), polysulfone (PSU) resin, polyether sulfone (PES) resin, polyphenyle It is possible to add polysulfone resin such as sulfone (PPSU) resin, polyphenylene sulfide (PPS) resin, polyphenylene sulfide ketone resin, polyphenylene sulfide sulfone resin, polyphenylene sulfide ketone sulfone resin and the like, liquid crystal polymer (LCP), etc. it can.

  Melt kneading of a polyether ether ketone resin having a repeating unit represented by the chemical formula [Chemical Formula 1] and a polyetherimide resin having a repeating unit represented by the chemical formula [Chemical Formula 2] and having a glass transition point of 200 ° C. or higher In addition to the above-mentioned resins, the molding material 2 made of a product includes an antioxidant, a light stabilizer, an ultraviolet absorber, a plasticizer, a lubricant, a flame retardant, an antistatic agent, and a heat improver as long as the characteristics of the present invention are not impaired. An inorganic compound, an organic compound, or the like is selectively added.

  The polyether ether ketone resin is not particularly limited, but is a resin having a repeating unit of the chemical formula [Chemical Formula 1].

  The melting point of the polyetheretherketone resin is usually 320 to 360 ° C, preferably 335 to 345 ° C. In the polyether ether ketone resin, n in the chemical formula [Chemical Formula 1] is preferably 10 or more, more preferably 20 or more, from the viewpoint of mechanical properties. The polyether ether ketone resin may be a homopolymer consisting only of a repeating unit of the chemical formula [Chemical Formula 1], or may have a repeating unit other than the chemical formula [Chemical Formula 1]. However, the proportion of the chemical structure of the chemical formula [Chemical Formula 1] in the polyetheretherketone resin is preferably 50 mol% or more, more preferably 70 mol% or more, and more preferably 80 mol% with respect to 100 mol% of the polyetheretherketone resin. Is the best.

  Specific examples of polyetheretherketone resins include: Victor Trek product name: Victorex Peak series, Daicel Evonik product name: Vesta Keep series, Solvay Specialty Polymers product name: KetaSpire polyetheretherketone Series.

  Examples of the method for producing the polyetheretherketone resin include JP-A-50-27897, JP-A-51-119797, JP-A-52-38000, JP-A-54-90296, and JP-B-55. The methods described in Japanese Patent Publication No. 23574 and Japanese Patent Publication No. 56-2091 are used. A block copolymer, a random copolymer, or a modified body with another copolymerizable monomer can be used as long as the polyether ether ketone resin does not impair the effects of the present invention.

  For a polyetherimide resin having a glass transition point of 200 ° C. or higher, a polyetherimide resin having a repeating unit of the chemical formula [Chemical Formula 2] is preferably used.

  It is known that a polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1] and a polyetherimide resin having a repeating unit of the Chemical Formula [Chemical Formula 2] have very good compatibility (patents) No. 4201965). On the other hand, it is known that a polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1] and a polyetherimide resin having a repeating unit of the Chemical Formula [Chemical Formula 3] have poor compatibility (patents). No. 4201965).

  The good compatibility between the polyether ether ketone resin having the repeating unit of the chemical formula [Chemical Formula 1] and the polyetherimide resin having the repeating unit of the Chemical Formula [Chemical Formula 2] is that the repeating unit of the chemical formula [Chemical Formula 1] is The peak temperature of loss tangent (tan δ) obtained by dynamic viscoelasticity measurement of a melt-kneaded product of a polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 2] is 140 to 250 ° C. It is known that only one is observed in between (see Japanese Patent No. 4201965). The peak temperature of the loss tangent becomes one, that is, between the polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1] and the polyether imide resin having a repeating unit of the Chemical Formula [Chemical Formula 2]. The glass transition point is also single, and the glass transition point of the melt-kneaded product is equal to or higher than the glass transition point of the polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1], and has a repeating unit of the chemical formula [Chemical Formula 2]. It appears within the range below the glass transition point of the etherimide resin (see JP-T-61-50023). Therefore, if a polyetherimide resin having a repeating unit of the chemical formula [Chemical Formula 2] is added to a polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1], a polyether having a repeating unit of the chemical formula [Chemical Formula 1] The molding material 2 which is more excellent in heat resistance than ether ketone resin can be obtained.

  Since a melt-kneaded product of a polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1] and a polyetherimide resin having a repeating unit of the Chemical Formula [Chemical Formula 3] is poor in compatibility, It is known that at least two peak temperatures of loss tangent obtained from viscoelasticity measurement are observed, which are derived from a polyetheretherketone resin component and a polyetherimide resin component mixed between 140 and 250 ° C. (See Japanese Patent No. 4201965).

  Two loss tangents are observed because two glass transition points derived from the polyetheretherketone resin component and the polyetherimide resin component are also observed, and thus consist of the polyetheretherketone resin and the polyetherimide resin. The melt-kneaded product cannot have higher heat resistance than the polyether ether ketone resin having a repeating unit of the chemical formula [Chemical Formula 1]. Moreover, since it is inferior to compatibility, the mechanical characteristics of a film will fall and it will be inferior to the thin moldability of a film.

  Specific examples of the polyetherimide resin having a repeating unit represented by the chemical formula [Chemical Formula 2] include ULTEM 1010-1000-NB (product name of SABIC Innovative Plastics), ULTEM 9011-1000-NB [same], and the like. Although it does not specifically limit as a manufacturing method of the polyetherimide resin which has a repeating unit of Chemical formula [Chemical Formula 2], Usually, 4,4 '-[isopropylidenebis (p-phenyleneoxy) diphthalic dianhydride Product] and m-phenylenediamine as known polycondensates.

  Specific examples of the polyetherimide resin having a repeating unit represented by the chemical formula [Chemical Formula 3] include ULTEM CRS5001-1000-NB [product name of SABIC Innovative Plastics]. Polyetherimide resin having a repeating unit of the chemical formula [Chemical Formula 3] is produced by polycondensation of 4,4 ′-[isopropylidenebis (p-phenyleneoxy) diphthalic dianhydride] and p-phenylenediamine. Examples of known production methods as products.

  A polyetherimide resin having a repeating unit of the chemical formula [Chemical Formula 3] can be added to the polyetherimide resin having a repeating unit of the chemical formula [Chemical Formula 2] within a range not impairing the effects of the present invention. Further, a block copolymer, a random copolymer, and a modified body with other copolymerizable monomers such as an amide group, an ester group, a sulfonyl group, and a siloxane group can be added. This includes, for example, ULTEM XH6050-1000 (product name of SABIC Innovative Plastics Co., Ltd.) having a glass transition point of 238 ° C., which is a polyetherimide sulfone copolymer, and ULTEM STM1700-1000 [SABIC Innovative, which is a polyetherimide / siloxane copolymer. Plastics product name] etc.

  A polyether ether ketone resin having a repeating unit represented by the chemical formula [Chemical Formula 1] and a polyetherimide resin having a repeating unit represented by the chemical formula [Chemical Formula 2] and having a glass transition point of 200 ° C. or higher are: It becomes polyether ether ketone resin 5-60 mass% and polyetherimide resin 95-40 mass% by a composition mass ratio. When the polyether ether ketone resin exceeds 60% by mass or the polyetherimide resin is less than 40% by mass, the loss tangent at 20 ° C. of the diaphragm film 1 of the speaker is less than 0.0150. This is because the heat resistance is lowered. On the other hand, when the polyether ether ketone resin is less than 5% by mass and the polyether imide resin exceeds 95% by mass, the mechanical properties (tensile strength) decrease, and the external output is increased. This is because a problem occurs in durability as a plate.

  When manufacturing the diaphragm film 1 for a speaker, a polyether ether ketone resin having a repeating unit represented by the chemical formula [Chemical Formula 1] and a glass transition point having a repeating unit of the chemical formula [Chemical Formula 2] of 200 ° C. or higher. The molding material 2 is prepared by melting and kneading the polyetherimide resin with an extrusion molding machine or the like for a predetermined time, and a band-shaped film for a diaphragm of the speaker is continuously melt-extruded by the molding material 2.

  The method for preparing the polyetheretherketone resin and the polyetherimide resin is as follows: (1) A method of preparing the molding material 2 by stirring and mixing the polyetheretherketone resin and the polyetherimide resin at room temperature, kneading and mixing; (2) The polyetherimide ketone resin is added to the molten polyetheretherketone resin without mixing the polyetherimideketone resin with the polyetherimide resin, and these are melt kneaded to prepare the molding material 2 Alternatively, a method of preparing the molding material 2 by adding a polyetheretherketone resin to a melted polyetherimide resin and melting and kneading them can be mentioned. Any of these methods can be employed, but the method (1) is preferred from the viewpoint of dispersibility and workability. In this specification, “normal temperature” refers to a temperature range of about 0 to 50 ° C.

  Here, the preparation method of (1) will be described. For the stirring and mixing of the polyether ether ketone resin and the polyetherimide resin, a tumbler mixer, a hensil mixer, a V-type mixer, a nauter mixer, a ribbon blender, a universal mixer A stirring mixer or the like is used. In addition, the polyether ether ketone resin and the polyetherimide resin are a mixture roll, a pressure kneader, a single screw extruder, a twin screw extruder, a three screw extruder, a four screw extruder, It can be prepared by melt-kneading and dispersing in a melt-kneader comprising a multi-screw extruder such as an eight-screw extruder.

  The temperature for preparing the polyetheretherketone resin and the polyetherimide resin is the melting point of the polyetheretherketone resin or the glass transition point of the polyetherimide resin to 450 ° C., preferably 350 to 430 ° C. This is because when the temperature of the melt kneader is less than the melting point of the polyether ether ketone resin or less than the glass transition point of the polyether imide resin, the polyether ether ketone resin and the polyether imide resin are uniformly dispersed by melt kneading. Because you can't. Moreover, when it exceeds 450 degreeC, since polyether ether ketone resin or polyetherimide resin decomposes | disassembles, it is based on the reason that it is not preferable.

  In addition, one of the polyether ether ketone resin and the polyetherimide resin can be dispersed in a predetermined amount or more to form a master batch.

  Next, the preparation method of (2) will be described. One of the polyetheretherketone resin and the polyetherimide resin is mixed with a mixing roll, a pressure kneader, a single screw extruder, a twin screw extruder, three After melting with a melt kneader composed of a multi-screw extruder such as a screw extruder, four-screw extruder, or eight-screw extruder, the other unmelted resin is added and melt-kneaded and dispersed. Thus, a molding material 2 composed of a polyetheretherketone resin and a polyetherimide resin is prepared.

  The temperature for preparing the polyetheretherketone resin and the polyetherimide resin is a melting point of the polyetheretherketone resin or a glass transition point of the polyetherimide resin to 450 ° C., preferably 350 to 430 ° C. When the temperature of the melt kneader is less than the melting point of the polyether ether ketone resin or less than the glass transition point of the polyether imide resin, the polyether ether ketone resin and the polyether imide resin are uniformly dispersed by melt kneading. This is because you cannot. Moreover, when it exceeds 450 degreeC, since polyether ether ketone resin or polyetherimide resin decomposes | disassembles, it is based on the reason that it is not preferable.

Molding material 2 made of polyetheretherketone resin and polyetherimide resin is extruded into a shape such as a strand or sheet, and then formed into a film, powder, granule, pellet or the like with a pulverizer or a cutter. Used in a form suitable for processing.
In addition, one of the polyether ether ketone resin and the polyetherimide resin can be dispersed in a predetermined amount or more to form a master batch.

  When the speaker diaphragm film 1 made of the molding material 2 is manufactured using the molding material 2 made of the polyether ether ketone resin and the polyetherimide resin, the speaker diaphragm film 1 made of the molding material 2 is melt-extruded. A known production method such as a calender molding method or a casting molding method can be employed. However, from the viewpoint of improving the thickness accuracy, productivity and handling properties of the diaphragm film 1 and simplifying the equipment, it is preferable to continuously extrude by a melt extrusion molding method.

  Here, as shown in FIG. 1, the melt extrusion molding method uses a melt extrusion molding machine 10 to melt and knead the molding material 2, and from the T die 13 at the front end of the melt extrusion molding machine 10 to the speaker diaphragm. It is the method of extruding the film 1 for manufacture continuously.

  The melt extrusion molding machine 10 includes, for example, a single screw extrusion molding machine or a twin screw extrusion molding machine, and functions to melt and knead the molding material 2 that has been charged. A raw material inlet 11 for the molding material 2 is installed at the upper rear of the melt extrusion molding machine 10. The raw material inlet 11 is inert to helium gas, neon gas, argon gas, krypton gas, nitrogen gas, or the like. An inert gas supply pipe 12 that supplies gas (see the arrow in FIG. 1) as necessary is connected, and the inflow of the inert gas through the inert gas supply pipe 12 causes oxidative deterioration and oxygen of the molding material 2. Crosslinking is effectively prevented.

  The temperature at the time of melt kneading in the melt extrusion molding machine 10 is adjusted to the melting point of the polyetheretherketone resin or the glass transition point of the polyetherimide resin to 450 ° C., preferably 360 to 430 ° C. This is because when the temperature is lower than the melting point of the polyether ether ketone resin or lower than the glass transition point of the polyether imide resin, the polyether ether ketone resin and the polyether imide resin cannot be uniformly dispersed by melt kneading. Conversely, when it exceeds 450 ° C., the polyether ether ketone resin or the polyetherimide resin is decomposed.

  The T-die 13 is attached to the distal end portion of the melt extrusion molding machine 10 via a connecting tube 14 and functions to continuously extrude the diaphragm film 1 of a band-shaped speaker. A gear pump 15 mounted on the connecting pipe 14 is located upstream of the T die 13, and the gear pump 15 transfers the molding material 2 to the T die 13 at a constant speed and with high accuracy.

  The temperature at the time of extrusion of the T die 13 is adjusted to the melting point of the polyether ether ketone resin or the glass transition point of the polyether imide resin to 450 ° C, preferably 360 ° C to 430 ° C. This is because, if the temperature is lower than the melting point of the polyether ether ketone resin or lower than the glass transition point of the polyether imide resin, the diaphragm film 1 of the band-shaped speaker cannot be continuously extruded. Conversely, when it exceeds 450 ° C., the polyether ether ketone resin or the polyetherimide resin is decomposed.

  A pair of crimping rolls 16 is pivotally supported below the T-die 13 so as to sandwich the cooling roll 17. Of the pair of crimping rolls 16, a winding tube 19 of a winder 18 that winds up the diaphragm film 1 is rotatably installed downstream of the downstream crimping roll 16. A slit blade 20 that forms a slit in the side portion of the diaphragm film 1 is disposed so as to be movable up and down between the 18 winding tubes 19, and the slit blade 20 and the winding tube of the winding machine 18. A required number of rotatable tension rolls 21 for supporting the diaphragm film 1 to be smoothly wound up by applying tension to the diaphragm film 1 are supported between the two.

  From the viewpoint of improving the adhesion between the diaphragm film 1 and the cooling roll 17, at least the natural rubber, the isoprene rubber, the butadiene rubber, the norbornene rubber, the acrylonitrile butadiene rubber, the nitrile rubber, and the urethane are provided on the peripheral surface of each pressure roll 16. A rubber layer such as rubber, silicone rubber, or fluorine rubber is coated as necessary, and an inorganic compound such as silica or alumina is selectively added to the rubber layer. Among these, it is preferable to employ silicone rubber or fluororubber having excellent heat resistance.

  As the pressure-bonding roll 16, a metal elastic roll having a metal surface and a metal belt are used as necessary. When this metal elastic roll is used, the film 1 for a diaphragm having a smooth surface can be formed. It becomes possible. Specific examples of the metal elastic roll include a metal sleeve roll, an air roll (a product name manufactured by Dimco), and a UF roll (a product name manufactured by Hitachi Zosen).

  Such a pressure roll 16 is adjusted to a temperature of 270 ° C. or lower, preferably 240 ° C. or lower, more preferably 50 ° C. to 230 ° C., and is slidably contacted with the diaphragm film 1 of the speaker and pressed against the cooling roll 17. To do. The temperature range of the pressure roll 16 is such that when the temperature of the pressure roll 16 exceeds 270 ° C., the diaphragm film 1 is adhered to the pressure roll 16 during the production of the diaphragm film 1, and the diaphragm of the speaker This is because the film 1 may be broken. On the contrary, when the temperature is lower than 50 ° C., it is not preferable because the pressure-bonding roll 16 is condensed. Examples of the temperature adjustment and cooling method of the pressure-bonding roll 16 include a method using a heat medium such as air, water, and oil, an electric heater, a dielectric heating roll, and the like.

  The cooling roll 17 is made of, for example, a metal roll having a diameter larger than that of the pressure-bonding roll 16, and the speaker diaphragm film 1 that is pivotally supported and pushed below the T-die 13 between the pressure-rolling roll 16. The diaphragm film 1 functions together with the pressure roll 16 while cooling the diaphragm film 1 within a predetermined range. The cooling roll 17 is adjusted to a temperature of 270 ° C. or lower, preferably 240 ° C. or lower, more preferably 50 ° C. to 230 ° C., and is in sliding contact with the diaphragm film 1, similarly to the press roll 16. This is because if the temperature of the cooling roll 17 exceeds 270 ° C., the diaphragm film 1 may stick to the cooling roll 17 during the production of the diaphragm film 1 and break. Further, when the temperature is lower than 50 ° C., the cooling roll 17 is condensed, which is not preferable. Examples of the temperature adjustment and cooling method of the cooling roll 17 include a method using a heat medium such as air, water, and oil, an electric heater, dielectric heating, and the like.

  In the above, when producing the diaphragm film 1 for a speaker, as shown in FIG. 1, the molding material 2 is supplied to the raw material inlet 11 of the melt extrusion molding machine 10 and the inert gas indicated by the arrow in FIG. Then, the molding material 2 is melted and kneaded in a heated and pressurized state by the melt extrusion molding machine 10, and the belt-shaped diaphragm film 1 is continuously extruded from the T die 13. At this time, the water content of the molding material 2 before melt kneading is adjusted to 2000 ppm or less, preferably 1000 ppm or less, more preferably 500 ppm or less. This is based on the reason that the diaphragm film 1 may foam when the moisture content of the molding material 2 before melt-kneading exceeds 2000 ppm.

  When the diaphragm film 1 is extruded, the diaphragm film 1 is wound around the winding tube 19 of the pair of pressure roll 16, the cooling roll 17, the tension roll 21, and the winder 18, and the diaphragm film 1 is cooled by the cooling roll 17. If both sides of the diaphragm film 1 are cut with the slit blades 20 and wound around the winding tube 19 in sequence, the diaphragm film made of a melt-kneaded product of polyetheretherketone resin and polyetherimide resin. 1 can be manufactured.

  Fine irregularities can be formed on the surface of the diaphragm film 1 as long as the effects of the present invention are not lost, and the friction coefficient of the surface of the diaphragm film 1 can be reduced. Thus, if the friction coefficient of the surface of the film 1 for diaphragms is reduced, blocking of the films 1 for diaphragms 1 can be prevented and damage to the film 1 for diaphragms can be prevented.

  As a method for forming such fine irregularities, for example, (1) a melt kneaded product of a polyether ether ketone resin and a polyether imide resin is melt kneaded by a melt extrusion molding machine 10, and the polyether ether ketone resin and poly A method in which a molding material 2 with an etherimide resin is discharged from a T-die 13 onto a cooling roll 17 having fine irregularities on its peripheral surface and closely adhered, and fine irregularities are simultaneously formed when the diaphragm film 1 is molded, (2 ) After manufacturing the diaphragm film 1, there is a method in which fine irregularities are formed on a cooling roll 17 having fine irregularities on its peripheral surface. Either method can be adopted, but from the viewpoint of simplification of equipment, the method (1) is preferable.

  The optimum loss tangent at 20 ° C. of the diaphragm film 1 after cooling is 0.0150 or more, preferably 0.0160 or more, more preferably 0.0160 to 0.0310. This is because good sound quality characteristics can be obtained if the loss tangent is 0.0150 or more.

  The heat resistance of the diaphragm film 1 after cooling can be represented by the first inflection point temperature of the storage elastic modulus (refer to FIG. 2 for this point). The first inflection point temperature of the storage elastic modulus is 175 ° C or higher, preferably 175 to 220 ° C, more preferably 180 to 220 ° C. This is because when the first inflection point temperature of the storage elastic modulus is less than 175 ° C., the diaphragm film 1 is inferior in heat resistance, so the diaphragm obtained by molding the diaphragm film 1 is a voice coil. This is because it is deformed or damaged by the generated heat.

Mechanical properties of the diaphragm film 1 after cooling, a tensile strength of 100 N / mm ² or more, preferably 110N / mm ² or more, and more preferably 110~131N / mm ^2. This is because when the tensile strength of the diaphragm film 1 is less than 100 N / mm ² , the diaphragm film 1 has a low strength, so that the diaphragm obtained by molding the diaphragm film 1 outputs an external output. This is because if it is increased, a problem arises in durability such as tearing.

  The optimal thickness of the diaphragm film 1 after cooling is 2 to 150 μm, preferably 2 to 125 μm, more preferably 3 to 100 μm. This is because, when the thickness of the diaphragm film 1 is less than 2 μm, the strength of the film is remarkably lowered. Therefore, the diaphragm film 1 is broken during molding, etc. This is because molding becomes difficult. On the contrary, when the thickness of the diaphragm film 1 exceeds 150 μm, the molding accuracy to the diaphragm is lowered. The thickness of the diaphragm film 1 can be measured with various micrometers.

  The thickness tolerance of the diaphragm film 1 is preferably within an average value ± 5%, and more preferably within an average value ± 3%. This is because if the thickness tolerance of the diaphragm film 1 is out of the range of the average value ± 5%, the sound quality varies, which is not preferable. The thickness tolerance of the diaphragm film 1 can be obtained by a predetermined formula.

  The crystallinity of the diaphragm film 1 can be expressed as a relative crystallinity, and the relative crystallinity can be calculated from [Equation 1]. About the relative crystallinity degree of this film 1 for diaphragms, it heated with the temperature increase rate of 10 degree-C / min using the differential scanning calorimeter, and the calorie | heat amount (J / g) of the crystal melting peak obtained at this time, The calorific value (J / g) of the recrystallization peak can be calculated by the following formula.

[Formula 1]
Relative crystallinity (%) = {1− (ΔHc / ΔHm)} × 100
Here, ΔHc represents the amount of heat (J / g) of the recrystallization peak of the diaphragm film 1 under the temperature rising condition of 10 ° C./min, and ΔHm represents the increase of 10 ° C./min of the diaphragm film 1. It represents the calorie (J / g) of the crystal melting peak under warm conditions.

  The relative crystallinity of the diaphragm film 1 can be appropriately selected depending on the method of using the diaphragm film 1. For example, when the diaphragm is subjected to secondary processing such as press molding, vacuum forming, and pressure forming from the diaphragm film 1, it is 70% or less, preferably 60% or less, more preferably 50% or less. This is because when the relative crystallinity of the diaphragm film 1 exceeds 70%, the secondary workability is deteriorated when the film is formed by a secondary processing method such as press molding, vacuum forming, or pressure forming. Because.

  As a method for adjusting the crystallinity of the diaphragm film 1 for a speaker, for example, (1) a melt kneaded product of a polyether ether ketone resin and a polyetherimide resin is melt kneaded by a melt extrusion molding machine 10, and this melt kneaded. The melt kneaded material of the polyether ether ketone resin and the polyether imide resin is discharged from the T die 13 onto the cooling roll 17 adjusted to a temperature of 270 ° C. or lower, preferably 230 ° C. or lower, more preferably 50 ° C. to 230 ° C. (2) After producing the diaphragm film 1, it is 270 ° C. or less, preferably 230 ° C. or less, more preferably 50 ° C. to 50 ° C. There is a method in which the degree of crystallinity is adjusted by closely contacting the cooling roll 17 adjusted to a temperature of 230 ° C. Any method can be adopted, but from the viewpoint of simplification of equipment, the method (1) is preferable.

  It should be noted that when the temperature of the cooling roll 17 exceeds 270 ° C., the diaphragm film 1 may stick to the cooling roll 17 and the speaker diaphragm film 1 of the speaker may break. In addition, when the temperature is lower than 50 ° C., it should be noted that the cooling roll 17 is condensed and an undesirable situation occurs.

  According to the above, since the diaphragm film 1 of the speaker is made of a molten mixture of a polyether ether ketone resin and a polyetherimide resin, it is lightweight and has excellent mechanical properties and an appropriate tensile elastic modulus. Therefore, it is possible to obtain a diaphragm having excellent characteristics and sound quality characteristics.

  In addition, on the surface of the diaphragm film 1 in the above embodiment, various antistatic agents, silicone resins, acrylic resins, urethane resins and other elastomers may be applied within a range not losing the effects of the present invention, aluminum, Various metals such as tin, nickel, and copper may be deposited.

Examples of the method for manufacturing a diaphragm film for a speaker according to the present invention will be described below together with comparative examples.
Example 1
First, polyetheretherketone resin [manufactured by Solvay Specialty Polymers, product name: KetaSpire polyetheretherketone grade: KT-851NL SP (hereinafter abbreviated as “KT-851NL SP”)] and polyetherimide resin [SABIC Product name: ULTEM, 9011-1000-NB, glass transition point: 210 ° C. (hereinafter abbreviated as “9011-1000”)] in a composition mass ratio, polyether ether ketone resin: 55 mass%, polyetherimide resin Was added to a tumbler mixer so as to be 45% by mass, and this tumbler mixer was stirred and mixed at 23 ° C. for 1 hour to prepare a stirred mixture. The glass transition point of the polyetherimide resin is determined by using a differential scanning calorimeter [manufactured by SII NanoTechnology Co., Ltd .: product name, high-sensitivity differential scanning calorimeter X-DSC7000], according to JIS K7121, and a temperature rising rate of 10 ° C. It measured on condition of / min. The measurement of the glass transition point was the same for the following examples and comparative examples.

  Once the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the stirring mixture is supplied to a twin screw extruder equipped with a vacuum pump, melt kneaded under reduced pressure, and twin screw extrusion molding It was extruded from a die at the tip of the machine into a rod shape, cut after water cooling, and a molding material which was a pellet-shaped intermediate was prepared. The stirred mixture was melt-kneaded under the conditions of a cylinder temperature of 360 to 380 ° C., a die temperature of 380 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 380 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single-screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The melt-kneaded molding material was continuously extruded from a T-die of a single screw extruder to extrude the diaphragm film into a strip shape.

  At this time, the moisture content of the molding material was measured by a Karl Fischer titration method using a trace moisture measuring device [product name CA-100 manufactured by Mitsubishi Chemical Corporation]. As a result of the measurement, the moisture content when the molding material was dried was 249 ppm. The measurement of the moisture content of the molding material was the same for the following examples and comparative examples. The single screw extruder was L / D = 32, compression ratio: 2.5, screw: full flight screw type. The cylinder temperature of this single screw extruder was adjusted to 360 to 380 ° C., the temperature of the T die was 385 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 380 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 375 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides of the continuous diaphragm film of the speaker are cut with a slit blade and wound up sequentially on a winder tube of a winder, having a length of 100 m and a width of 620 mm. A film for a diaphragm of a speaker was manufactured. At this time, the film for the diaphragm of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll which is a 200 ° C. cooling roll with irregularities on the peripheral surface, and a 6-inch winding tube located downstream of these. Were sequentially wound and sandwiched between a crimping roll and a metal roll.

  Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 200 ° C. and brought into contact with the metal roll for 1.8 seconds. The contact time with the metal roll can be calculated from the following [Equation 2].

[Formula 2]
Contact time (seconds) = [contact distance with metal roll (m)] / [rotation speed of metal roll (m / second)]

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss tangent of this diaphragm film are evaluated, and the results are It described in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

・ Film thickness of diaphragm film The thickness of a diaphragm film having a film thickness of 2 to 10 μm was measured using a contact-type thickness meter (product name: Electronic Micrometer Miroton 1240, manufactured by Mahr). did. On the other hand, the thickness of the diaphragm film having a film thickness exceeding 10 μm to 150 μm was measured using a micrometer [product name: coolant proof micrometer code MDC-25PJ, manufactured by Mitutoyo Corporation].

  In the measurement, 100 thicknesses at predetermined positions where the extrusion direction and the width direction (the direction perpendicular to the extrusion direction) of the diaphragm film intersect were measured, and the average value was taken as the film thickness. The measurement locations in the extrusion direction were 100 mm, 200 mm, 300 mm, 400 mm, and 500 mm at 100 mm intervals from the tip of the diaphragm film.

  On the other hand, the measurement position in the width direction is 25 mm from the left end of the diaphragm film, then 55 mm, 85 mm, 115 mm, 145 mm, 175 mm, 205 mm, 235 mm, 265 mm, 295 mm, 325 mm, 355 mm, 385 mm, 385 mm, 415 mm at 30 mm intervals. 445 mm, 475 mm, 505 mm, 535 mm, 565 mm, and 595 mm.

-Film thickness tolerance of diaphragm film The film thickness tolerance of the diaphragm film was obtained from the following equation.
Film thickness tolerance [%] = {(MAX or MIN) − (AVE)} / (AVE) × 100
Where MAX: maximum value of film thickness
MIN: Minimum film thickness
AVE: Average value of film thickness A when the obtained film thickness tolerance was within ± 3%, B when within ± 3 to 5%, and NG when over ± 5%.

-Specific gravity of the diaphragm film The specific gravity of the diaphragm film was measured under the condition of a temperature of 23 ° C in accordance with the measuring method of JIS K7112 (Method A).

-Relative crystallinity of diaphragm film For relative crystallinity of diaphragm film, 10 mg of measurement sample was weighed from diaphragm film, and differential scanning calorimeter (product name: EXSTAR7000 manufactured by SII Nano Technologies) Series X-DSC7000] is heated at a heating rate of 10 ° C./min. From the heat amount (J / g) of the crystal melting peak and the heat amount (J / g) of the recrystallization peak obtained at this time, This was calculated using the following formula.

Relative crystallinity (%) = {1− (ΔHc / ΔHm)} × 100
Here, ΔHc represents the amount of heat (J / g) of the recrystallization peak under the temperature rising condition of 10 ° C./min of the diaphragm film, and ΔHm is the temperature rising condition of 10 ° C./min of the diaphragm film. It represents the calorie (J / g) of the crystal melting peak below.

-Mechanical properties of the diaphragm film The mechanical properties of the diaphragm film were evaluated by tensile strength.
The tensile strength was measured under the conditions of a tensile speed of 50 mm / min and a temperature of 23 ° C. in accordance with JIS K7127 (test piece: type 1B). The tensile strength was measured in the film extrusion direction and the width direction (perpendicular to the extrusion direction), and the tensile strength was obtained with the maximum strength.

-Tensile elastic modulus of diaphragm film The film tensile modulus of elasticity for the diaphragm was measured under the conditions of a tensile speed of 50 mm / min and a temperature of 23 ° C in accordance with JIS K7127 (test piece: type 1B). The tensile modulus was measured in the film extrusion direction and the width direction (perpendicular to the extrusion direction).

-Heat resistance of the diaphragm film The heat resistance of the diaphragm film was evaluated by the first inflection point temperature of the storage elastic modulus (E '). The storage elastic modulus of the diaphragm film was measured in the extrusion direction and the width direction (the direction perpendicular to the extrusion direction) of the diaphragm film.

  Specifically, when measuring the storage elastic modulus of the diaphragm film in the extrusion direction, the size is 60 mm in the extrusion direction × 6 mm in the width direction, and when measuring the storage elastic modulus in the width direction, the size is 6 mm in the extrusion direction × 60 mm in the width. Cut out and measured. In measuring the storage elastic modulus, the frequency was 3 Hz, the strain was 0.1%, and the rate of temperature rise was determined by a tensile mode using a viscoelastic spectrometer [product name: RSA-G2 manufactured by TS Instruments Japan Co., Ltd.]. The measurement was performed under the conditions of 3 ° C./min, measurement temperature range −60 to 360 ° C., and check interval 21 mm.

  As shown in FIG. 2, the first inflection point temperature is a temperature at an intersection obtained by extending two linear portions with respect to the storage elastic modulus change curve. The first straight line (a) is drawn by extending the straight line part before the storage elastic modulus suddenly decreases to the high temperature side. The straight line portion of the intermediate line after the storage elastic modulus first suddenly decreases is extended to the low temperature side, and a second straight line (b) is drawn. A vertical line at the intersection of the two lines (a) and (b) was drawn on the horizontal temperature axis, and the temperature was determined as the first inflection point temperature.

Loss tangent of diaphragm film The loss tangent of the diaphragm film was measured in the extrusion direction and the width direction (perpendicular to the extrusion direction). Specifically, when the loss tangent in the extrusion direction is measured, the diaphragm film is cut into a size of 60 mm in the extrusion direction × 6 mm in the width direction, and 6 mm in the extrusion direction × 60 mm in the width direction when the loss tangent in the width direction is measured. It was measured. When measuring the loss tangent, the tension mode using a viscoelastic spectometer [product name: RSA-G2 manufactured by TS Instruments Japan Co., Ltd.], frequency 3 Hz, strain 0.1%, heating rate 3 ° C. / Min, measurement temperature range of -60 to 360 ° C., 21 mm between chucks, and a loss tangent of 20 ° C. was obtained.

Example 2
First, the polyether ether ketone resin and the polyetherimide resin used in Example 1 were put into a tumbler mixer so that the composition mass ratio would be polyether ether ketone resin: 50 mass% and polyether imide resin: 50 mass%. Thereafter, a stirring mixture was prepared in the same manner as in Example 1.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under conditions of a cylinder temperature of 360 to 380 ° C., a die temperature of 380 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 380 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 255 ppm. The single screw extruder used was the same extruder as in Example 1. The cylinder temperature of this single screw extruder was adjusted to 360 to 380 ° C., the temperature of the T die was 385 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 380 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 374 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides are cut with a slit blade in the same manner as in Example 1, and the film is sequentially wound around a winding tube of a winder, and is a band having a length of 100 m and a width of 620 mm. A shaped film was produced. At this time, the belt-shaped film is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 130 ° C. with irregularities on the peripheral surface, and a 6-inch winding tube located downstream of these rolls. Were sequentially wound and sandwiched between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 130 ° C. and brought into contact with the metal roll for 10.8 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Example 3
Using the molding material made of the polyetheretherketone resin and the polyetherimide resin produced in Example 2, the same apparatus as in Example 2 was used, and the diaphragm film was extruded into a strip shape under the same conditions.

  When the diaphragm film is extruded into a band shape, both sides are cut with a slit blade in the same manner as in Example 1, and the film is sequentially wound around a winding tube of a winder, and has a length of 100 m and a width of 620 mm. The film was manufactured. At this time, the band-shaped film is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 210 ° C. with irregularities on the peripheral surface, and a 6-inch winding tube located downstream of these rolls. Were sequentially wound and sandwiched between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 210 ° C. and brought into contact with the metal roll for 14.2 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Example 4
First, polyetheretherketone resin [manufactured by Daicel-Evonik, product name: Betakeep, grade name: 3300G (hereinafter abbreviated as “3300G”)], and polyetherimide resin [manufactured by SABIC, product name: ULTEM: 1010− 1000-NB, glass transition point: 211 ° C. (hereinafter abbreviated as “1010-1000”)] in a composition mass ratio: 40% by mass, and polyetherimide resin is 60% by mass, and put into a tumbler mickey. Thereafter, a stirring mixture was prepared in the same manner as in Example 1.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under the conditions of a cylinder temperature of 360 to 3800 ° C., a die temperature of 380 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 380 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 238 ppm. The single screw extruder used was the same extruder as in Example 1. The cylinder temperature of this single screw extruder was adjusted to 360 to 380 ° C., the temperature of the T die was 380 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 380 ° C.

  As for the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 373 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides are cut with a slit blade in the same manner as in Example 1 and wound up sequentially around the winding tube of the winder, and the speaker has a length of 100 m and a width of 620 mm. A diaphragm film was manufactured. At this time, the diaphragm film of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 210 ° C. with irregularities on the peripheral surface, and a 6-inch roll positioned downstream thereof. It wound around the intake tube sequentially and was clamped between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 210 ° C. and brought into contact with the metal roll for 14.3 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Example 5
First, polyether ether ketone resin (product name: KetaSpire polyether ether ketone grade: KT-820NT (hereinafter abbreviated as “KT-820NT”) manufactured by Solvay Specialty Polymers) and the polyetherimide resin used in Example 4 Were added to a tumbler mixer so that the composition mass ratio of polyetheretherketone resin: 30% by mass and polyetherimide resin: 70% by mass was prepared, and a stirring mixture was prepared in the same manner as in Example 1 below. .

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under conditions of a cylinder temperature of 350 to 370 ° C., a die temperature of 370 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 370 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content during drying of the molding material was 241 ppm. The single screw extruder used was the same extruder as in Example 1. The cylinder temperature of this single screw extruder was adjusted to 350 to 370 ° C., the temperature of the T die was adjusted to 370 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 375 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 370 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides of the continuous diaphragm film of the speaker are cut with a slit blade and wound up sequentially on a winder tube of a winder, having a length of 100 m and a width of 620 mm. A film for a diaphragm of a speaker was manufactured. At this time, the diaphragm film of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 140 ° C. with irregularities on the peripheral surface, and a 6-inch roll positioned downstream of these. It wound around the intake tube sequentially and was clamped between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 140 ° C. and brought into contact with the metal roll for 5.3 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Example 6
First, polyetheretherketone resin [product name: VictrexPEEK381G (hereinafter abbreviated as “381G”)] manufactured by Victrex Co., and polyetherimide resin similar to that in Example 4 is a polyetheretherketone resin in a composition mass ratio. : 20% by mass, polyetherimide resin: 80% by mass was charged into a tumbler mixer, and a stirred mixture was prepared in the same manner as in Example 1 below.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under conditions of a cylinder temperature of 350 to 370 ° C., a die temperature of 370 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 370 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 267 ppm. The single screw extruder used was the same extruder as in Example 1. The temperature of this single screw extruder was adjusted to 350 to 370 ° C., the temperature of the T die was adjusted to 375 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 370 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 367 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides of the continuous diaphragm film of the speaker are cut with a slit blade and wound up sequentially on a winder tube of a winder, having a length of 100 m and a width of 620 mm. A film for a diaphragm of a speaker was manufactured. At this time, the diaphragm film of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll which is a cooling roll heated to 150 ° C. with irregularities on the peripheral surface, and a 6-inch roll located downstream of these. It wound around the intake tube sequentially and was clamped between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 150 ° C. and brought into contact with the metal roll for 10.4 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Example 7
First, in the tumbler mixer, the polyether ether ketone resin and the polyetherimide resin used in Example 1 are in a composition mass ratio of polyether ether ketone resin: 10 mass% and polyether imide resin: 90 mass%. Thereafter, a stirring mixture was prepared in the same manner as in Example 1.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under conditions of a cylinder temperature of 350 to 370 ° C., a die temperature of 370 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 370 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 229 ppm. The single screw extruder used was the same extruder as in Example 1. The temperature of this single screw extruder was adjusted to 350 to 370 ° C., the temperature of the T die was adjusted to 375 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 370 ° C.

  As for the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 365 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides of the continuous diaphragm film of the speaker are cut with a slit blade and wound up sequentially on a winder tube of a winder, having a length of 100 m and a width of 620 mm. A film for a diaphragm of a speaker was manufactured. At this time, the diaphragm film of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 130 ° C. with irregularities on the peripheral surface, and a 6-inch roll positioned downstream of these. It wound around the intake tube sequentially and was clamped between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 130 ° C. and brought into contact with the metal roll for 0.6 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 1. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Comparative Example 1
First, the same polyether ether ketone resin used in Example 1 and the same polyether imide resin used in Example 1 were polyether ether ketone resin: 70% by mass, polyether in compositional mass ratio. Imide resin: The mixture was charged into a tumbler mixer so as to be 30% by mass, and a stirring mixture was prepared in the same manner as in Example 1 below.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under the conditions of a cylinder temperature of 370 to 390 ° C., a die temperature of 390 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 390 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 261 ppm. The single screw extruder used was the same extruder as in Example 1. The temperature of this single screw extruder was adjusted to 380 to 390 ° C., the temperature of the T die was adjusted to 390 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 395 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 385 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides of the continuous diaphragm film of the speaker are cut with a slit blade and wound up sequentially on a winder tube of a winder, having a length of 100 m and a width of 620 mm. A film for a diaphragm of a speaker was manufactured. At this time, the film for the diaphragm of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a 210 ° C. cooling roll with irregularities on the peripheral surface, and a 6-inch take-up tube located downstream thereof. Were sequentially wound and sandwiched between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 210 ° C. and brought into contact with the metal roll for 1.9 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 2. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Comparative Example 2
First, the same polyetheretherketone resin used in Example 6 and the same polyetherimide resin used in Example 4 were polyetheretherketone resin: 70% by mass, polyether in compositional mass ratio. Imide resin: The mixture was charged into a tumbler mixer so as to be 30% by mass, and a stirring mixture was prepared in the same manner as in Example 1 below.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under the conditions of a cylinder temperature of 370 to 390 ° C., a die temperature of 390 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 390 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 233 ppm. The single screw extruder used was the same extruder as in Example 1. The temperature of this single screw extruder was adjusted to 370 to 390 ° C., the temperature of the T die was 395 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 390 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 386 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  When the diaphragm film is extruded into a band shape in this way, both sides of the continuous diaphragm film of the speaker are cut with a slit blade and wound up sequentially on a winder tube of a winder, having a length of 100 m and a width of 620 mm. A film for a diaphragm of a speaker was manufactured. At this time, the diaphragm film of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 140 ° C. with irregularities on the peripheral surface, and a 6-inch roll positioned downstream of these. It wound around the intake tube sequentially and was clamped between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 140 ° C. and brought into contact with the metal roll for 14.3 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 2. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Comparative Example 3
First, the same polyether ether ketone resin and polyether imide resin used in Example 1 were such that the composition mass ratio was polyether ether ketone resin: 1 mass% and polyether imide resin: 99 mass%. The mixture was put into a tumbler mixer, and a stirred mixture was prepared in the same manner as in Example 1 below.

  After the polyether ether ketone resin and the polyetherimide resin are stirred and mixed to prepare a stirring mixture, the mixture is supplied to the same twin-screw extruder as in Example 1, and melt-kneaded under reduced pressure. Extruded into a rod shape from the tip die and cut after water cooling to prepare a molding material which is a pellet-shaped intermediate. The stirred mixture was melt-kneaded under conditions of a cylinder temperature of 340 to 360 ° C., a die temperature of 360 ° C., and a temperature of a connecting tube connecting the twin screw extruder and the die of 360 ° C.

  Next, the molding material is dried in a dehumidifying dryer heated to 150 ° C. for 12 hours. The dried molding material is set in a φ40 mm single screw extruder equipped with a T die having a width of 900 mm, and melt-kneaded. The kneaded molding material was continuously extruded from a T-die of a single screw extrusion molding machine, and the diaphragm film was extruded into a band shape. The moisture content when the molding material was dried was 238 ppm. The single screw extruder used was the same extruder as in Example 1. The temperature of this single screw extruder was adjusted to 340 to 360 ° C., the temperature of the T die was 365 ° C., and the temperature of the connecting pipe connecting the single screw extruder and the T die was adjusted to 360 ° C.

  Regarding the temperature of the molten molding material, the resin temperature at the inlet of the T die was measured, and the measured temperature was 355 ° C. Further, when charging the molding material into the single screw extruder, nitrogen gas of 18 L / min was supplied.

  Once the diaphragm film is extruded into a strip shape, both sides of the diaphragm film of the continuous speaker are cut with a slit blade and wound up sequentially on the winder tube of the winder, and the speaker with a length of 100 m and a width of 620 mm A diaphragm film was manufactured. At this time, the diaphragm film of the speaker is composed of a pair of pressure-bonding rolls made of silicone rubber, a metal roll that is a cooling roll heated to 210 ° C. with irregularities on the peripheral surface, and a 6-inch roll positioned downstream thereof. It wound around the intake tube sequentially and was clamped between a crimping roll and a metal roll. Here, the metal roll which is a cooling roll provided with unevenness on the peripheral surface was heated to 210 ° C. and brought into contact with the metal roll for 5.3 seconds.

  Once the diaphragm film is obtained, the film thickness, film thickness tolerance, specific gravity, relative crystallinity, mechanical properties, tensile modulus, heat resistance, and loss of the diaphragm film are obtained in the same manner as in Example 1. The tangent was evaluated and the results are listed in Table 2. The mechanical properties were evaluated by the tensile strength, and the heat resistance was evaluated by the first inflection point temperature of the storage elastic modulus.

Results The diaphragm film for a speaker obtained by the method of each example has a tensile strength of 100 N / mm ² or more, a heat resistance of 175 ° C. or more, and a diaphragm having excellent durability and heat resistance can be obtained. did it. Further, since the tensile elastic modulus was 2500 to 3500 N / mm ² and the loss tangent was 0.0150 or more, a diaphragm having a wide reproduction frequency range and excellent sound quality characteristics could be obtained. In addition, since the specific gravity is in the range of 1.20 to 1.30, excellent lightness can be obtained.

On the other hand, the diaphragm film for the speaker obtained by the methods of Comparative Examples 1 and 2 had a heat resistance problem because it had a heat resistance of 170 ° C. or lower. In addition, since the loss tangent is less than 0.0150, there is a problem in sound quality characteristics. Moreover, since the film for speaker diaphragms obtained in Comparative Example 3 had a tensile strength of less than 100 N / mm ² , when it was used as a diaphragm for speakers, there was a problem in durability.

  The method for manufacturing a film for a diaphragm of a speaker according to the present invention is used in the manufacturing field of various types of audio equipment and electronic equipment.

DESCRIPTION OF SYMBOLS 1 Film for diaphragm 2 Molding material 10 Melt extrusion molding machine (extrusion molding machine)
13 T Dice (Dice)
16 Pressure roll 17 Cooling roll 18 Winding machine 19 Winding pipe 20 Slit blade 21 Tension roll

Claims (2)

A film for a diaphragm is extruded from a die of an extrusion molding machine using a molding material composed of a polyether ether ketone resin and a polyetherimide resin, and the extruded film for a diaphragm is subjected to a pressure roll, a cooling roll, and a winding roll. A manufacturing method for producing a diaphragm film by winding the take-up machine and sandwiching the diaphragm film between a pressure roll and a cooling roll ,
A polyetheretherketone resin having a repeating unit represented by the following chemical formula [Chemical Formula 1], a polyetherimide resin having a repeating unit represented by the following chemical formula [Chemical Formula 2], and having a glass transition point of 200 ° C. or higher; A molding material is prepared by melting and kneading a mixture comprising a melting point of a polyether ether ketone resin or a glass transition point of the polyetherimide resin to a temperature of 450 ° C., and a composition mass ratio of the molding material is changed to a polyether ether. 5-60 mass% ketone resin and 95-40 mass% polyetherimide resin,
The prepared molding material is continuously extruded into the diaphragm film of the speaker by a T die heated to a melting point of the polyether ether ketone resin of the extruder or a glass transition point of the polyetherimide resin to 450 ° C. shaped, interposed therebetween relative crystallinity of the diaphragm film by cooling between the extruded pressing roll which is adjusted diaphragm film to a temperature of 50 ° C. to 230 ° C. and the cooling roll 70 % Or less,
The characteristics of the diaphragm film after cooling are as follows: loss tangent at 20 ° C. is 0.0150 to 0.0310, tensile strength is 100 to 131 N / mm ² , tensile elastic modulus is 2000 to 3500 N / mm ² , and heat resistance is 175. A method for producing a film for a speaker diaphragm, characterized in that the film has a specific gravity of 1.24 to 1.28 and a thickness of 2 to 150 μm.

  A take-up machine for the diaphragm film is installed downstream of the press roll, and a slit blade is formed between the press roll and the take-up machine to form a slit on the side of the diaphragm film. The method for producing a diaphragm film for a speaker according to claim 1, wherein a tension roll for applying tension to the diaphragm film is rotatably supported between the slit blade and the winder.

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