CN116887150A - Loudspeaker cone and preparation method and application thereof - Google Patents
Loudspeaker cone and preparation method and application thereof Download PDFInfo
- Publication number
- CN116887150A CN116887150A CN202311095132.2A CN202311095132A CN116887150A CN 116887150 A CN116887150 A CN 116887150A CN 202311095132 A CN202311095132 A CN 202311095132A CN 116887150 A CN116887150 A CN 116887150A
- Authority
- CN
- China
- Prior art keywords
- cone
- chitosan
- loudspeaker
- pulp
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 159
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 94
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 94
- 241001330002 Bambuseae Species 0.000 claims abstract description 94
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 94
- 239000011425 bamboo Substances 0.000 claims abstract description 94
- 229920001661 Chitosan Polymers 0.000 claims abstract description 60
- 244000025254 Cannabis sativa Species 0.000 claims abstract description 30
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims abstract description 30
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims abstract description 30
- 235000009120 camo Nutrition 0.000 claims abstract description 30
- 235000005607 chanvre indien Nutrition 0.000 claims abstract description 30
- 239000011487 hemp Substances 0.000 claims abstract description 30
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 21
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 28
- 238000004537 pulping Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000010009 beating Methods 0.000 claims description 21
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 150000007513 acids Chemical class 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 239000000725 suspension Substances 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 238000004080 punching Methods 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 238000013016 damping Methods 0.000 abstract description 17
- 230000002195 synergetic effect Effects 0.000 abstract description 7
- 230000004044 response Effects 0.000 abstract description 5
- 230000000295 complement effect Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 239000000123 paper Substances 0.000 description 23
- 206010061592 cardiac fibrillation Diseases 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 230000002600 fibrillogenic effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000002655 kraft paper Substances 0.000 description 8
- 229960000583 acetic acid Drugs 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010902 straw Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 241000933832 Broussonetia Species 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000012362 glacial acetic acid Substances 0.000 description 3
- 229910021389 graphene Inorganic materials 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 244000146553 Ceiba pentandra Species 0.000 description 1
- 235000003301 Ceiba pentandra Nutrition 0.000 description 1
- 241001397809 Hakea leucoptera Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006196 deacetylation Effects 0.000 description 1
- 238000003381 deacetylation reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000009290 primary effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Manufacturing & Machinery (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
The invention provides a loudspeaker cone, a preparation method and application thereof, wherein the preparation raw materials of the loudspeaker cone comprise the following components in parts by mass: 20-70 parts of bleached sulfate wood pulp, 5-40 parts of bark pulp, 5-40 parts of hemp pulp, 2-50 parts of bamboo fiber and 0.1-3 parts of chitosan. The bleached sulfate wood pulp, bark pulp, hemp pulp, bamboo fiber and chitosan with specific dosage are matched with each other, the fibers with different characteristics have synergistic effect and/or complementary performances, and the components have synergistic effect, so that the strength of the cone can be effectively improved, the density is reduced, the Young modulus of the cone of the loudspeaker is high, the density is low, the frequency corresponding range of the loudspeaker is widened, and the sensitivity of the loudspeaker is improved; meanwhile, the loudspeaker cone has moderate internal damping, can restrain the split vibration of the cone, enables the loudspeaker to have flatter frequency response characteristic, and improves the medium-low frequency tone quality of the loudspeaker.
Description
Technical Field
The invention belongs to the technical field of speakers, and particularly relates to a speaker cone, a preparation method and application thereof.
Background
The working principle of the loudspeaker is that when alternating audio current is conducted in a voice coil connected with a cone and a centering support piece, the voice coil vibrates under the action of electromagnetic force in a magnetic field, so that the cone is driven to push air to vibrate, and sound is generated. The characteristics of the cone directly affect electroacoustic parameters, sound quality and service life of the loudspeaker, and are key components of a vibration system.
In order to improve the acoustic performance of a speaker, studies on cone formulation and process are not spent in industry, for example, CN111279722a discloses a cone manufacturing method for improving the acoustic performance of a speaker, which comprises the following specific steps: pulping unbleached sulfate pulp, straw and carbon fiber to obtain a first pulp, wherein the formula ratio is as follows: 70% of unbleached sulfate pulp, 15% of straw and 15% of carbon fiber; mixing the first slurry, the sizing material, the precipitant and the dye by adopting a stirring device to obtain second slurry; fishing the second sizing agent to obtain a cone blank; the cone blank is sequentially subjected to an automatic or semi-automatic hot press, an automatic temperature control device and a cone hot pressing mould to obtain a cone which is formed by hot pressing, and is subjected to post treatment to obtain a composite cone with good performance, so that the sound performance of the loudspeaker is improved. CN109968737a discloses a cone formulation for improving the sound performance of a loudspeaker, which comprises the following components in percentage by weight: 1% -50% of unbleached sulfate pulp, 30% -50% of bleached sulfite pulp and 1% -20% of bulletproof cloth; the cone and the loudspeaker obtained by the formula have higher sound layering sense and restoring capability. CN113846513a discloses a graphene cone formula, which comprises the following raw materials in parts by weight: 30-40% of pulp board (EKB), 50-58% of pulp board (North wood), 2-5% of kapok fiber, 8-12% of direct black red light 3BG dye, 8-10% of aluminum sulfate, 8-12% of industrial salt, 0.2-1% of graphene, 40-50% of polypropylene raw material, 1-1.5% of lubricant, 4.5-3% of maleic anhydride and 1-0.5% of white oil; according to the formula, the graphene is added, so that the rigidity of the paper cone can be improved, the weight is not increased, and the effects of improving low-medium-high frequency tone quality, increasing power and improving sound pressure are achieved.
Research shows that the cone material meets the following requirements: (1) The density rho of the material is small, the density of the cone is reduced, and the vibration quality of the loudspeaker can be reduced, so that the sensitivity of the loudspeaker is improved; (2) The Young modulus of the material is large, so that the Young modulus of the cone is improved, the split vibration and phase distortion of the unit can be reduced, and the frequency response range of the loudspeaker is improved; (3) The damping device has proper internal damping, can restrain the segmentation vibration of the cone, and has flatter frequency response characteristic. Although the prior art discloses the formulation and the preparation process of the cone, the cone has the difficulty in achieving good effects in three aspects of low density, high modulus and proper internal damping, so that the cone has poor comprehensive performance, and the performance requirement of a high-performance loudspeaker is difficult to meet.
Therefore, development of paper cone materials with low density, high Young's modulus, proper internal damping and excellent comprehensive performance is a problem to be solved in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the loudspeaker cone, the preparation method and the application thereof, and the design and the mutual compounding of bleached sulfate wood pulp, tree bark pulp, hemp pulp, bamboo fiber and chitosan enable the loudspeaker cone to have high Young modulus, small density and moderate internal damping.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a loudspeaker cone, which comprises the following raw materials in parts by mass:
the invention adopts bleached sulfate wood pulp, bark pulp, hemp pulp, bamboo fiber and chitosan with specific dosage as the preparation raw materials of the loudspeaker cone, wherein: (1) The bleached sulfate wood pulp (BKP) is coarse and long fiber, the cell cavity is small, the cell wall thickness, namely the fiber cell wall cavity ratio is large, the fiber is hard and has high rigidity, the thick-wall fiber has a great influence on wet compressibility, and the original tubular form of the bleached sulfate wood pulp (BKP) can be more reserved during extrusion drying. (2) The tree bark pulp has good fiber form, and the longer fibers thereof enable the paper to have high tearing strength, thereby creating favorable conditions for improving the strength of the paper cone. (3) The fiber outer wall of the hemp pulp is free of gel coat, the cell wall is extremely small, the fiber is polygonal, and the fiber is high in toughness and elasticity, so that the strength of the paper cone is improved. (4) The natural physical properties of the bamboo are maintained by the bamboo fiber, and the fiber contains a large number of hollow structures and cells, so that the density of the cone is reduced, and the tone and tone quality of the loudspeaker are improved. (5) The chitosan and the cellulose have a relatively similar structure, have obvious affinity to plant fibers, and can be adsorbed by the plant fibers and filled between the fibers as a preparation raw material, and the filling effect can increase the combination between the fibers, so that the improvement of the strength of the cone is facilitated; meanwhile, the active groups on the surface of the chitosan can form hydrogen bonds with hydroxyl groups on the surface of the cellulose, so that the strength of the paper cone is further improved.
Particularly, the bamboo fiber is introduced into the loudspeaker cone, and is prepared by a physical and mechanical method through monolith, sheet making, wire dividing, carding and screening, and is a naturally obtained beam-shaped, wire-shaped or flocculent bamboo fiber unit, and single fiber cells or a plurality of fiber cells of the bamboo are contained for aggregation, so that the natural physical properties and biochemical properties of the bamboo are effectively maintained. The bamboo fiber belongs to a cellulose I-type crystal structure with good heat stability, high crystallinity, compact macromolecular arrangement and complete retention of molecular structure, the cavity structure is more complete, transverse sections are arranged longitudinally, micro grooves are distributed on the surface of the fiber, the fiber is in an irregular oval shape, a oval shape and the like transversely, and the bamboo fiber has the advantages of small density, light weight and high strength and rigidity, and has excellent effects on the reduction of the density of a cone, the improvement of the strength, the improvement of tone quality/tone color and auditory sense.
Therefore, the invention adopts bleached sulfate wood pulp (BKP), bark pulp, hemp pulp and bamboo fiber to compound in specific dosage, fibers with different characteristics are complementary through synergistic effect and/or performance, and compound with chitosan, and the components are synergistic, so that the strength and Young modulus of the speaker cone are high, the density is small, the frequency corresponding range of the speaker is widened, and the sensitivity of the speaker is improved; meanwhile, the loudspeaker cone has moderate internal damping, can restrain the split vibration of the cone, enables the loudspeaker to have flatter frequency response characteristic, and improves the medium-low frequency tone quality of the loudspeaker.
In the raw materials for preparing the speaker cone provided by the invention, the mass parts of the bleached sulfate wood pulp are 20-70 parts, for example, 25 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts or 65 parts, and specific point values among the above point values are limited in space and in the interest of brevity, and the invention is not exhaustive to list the specific point values included in the range.
The mass parts of the bark pulp are 5-40 parts, for example, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts or 38 parts, and specific point values among the above point values, are limited in space and for brevity, the present invention is not exhaustive list of specific point values included in the range.
The mass parts of the hemp pulp are 5-40 parts, for example, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts or 38 parts, and specific point values among the above point values, which are limited in space and for brevity, the invention is not exhaustive list of specific point values included in the range.
The mass parts of the bamboo fiber are 2-50 parts, for example, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts or 48 parts, and specific point values among the above point values are limited in space and for brevity, the present invention is not exhaustive to list the specific point values included in the range.
The mass part of the chitosan is 0.1-3 parts, for example, 0.2 parts, 0.5 parts, 0.6 parts, 0.8 parts, 1 parts, 1.1 parts, 1.3 parts, 1.5 parts, 1.7 parts, 1.9 parts, 2 parts, 2.2 parts, 2.5 parts or 2.8 parts, and specific point values among the above point values are limited to the space and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the range.
The following is a preferred technical scheme of the present invention, but not a limitation of the technical scheme provided by the present invention, and the following preferred technical scheme can better achieve and achieve the objects and advantages of the present invention.
Preferably, the preparation raw materials of the loudspeaker cone comprise the following components in parts by mass:
preferably, the Bleached Kraft Pulp (BKP) has a fiber length distribution of 0.3-4.11mm, which may be, for example, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, or 4mm, and specific point values between the above point values, and the invention is not intended to be exhaustive of the specific point values encompassed by the described ranges for reasons of brevity and conciseness.
Preferably, the Bleached Kraft Pulp (BKP) has an average fiber length of 2-3mm, which may be, for example, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, or 2.9mm, and specific point values between the above point values, for reasons of brevity and for brevity, the invention is not intended to be exhaustive of the specific point values encompassed by the scope.
Preferably, the Bleached Kraft Pulp (BKP) has a fiber fibrillation ratio of 2-2.5%, such as 2.05%, 2.1%, 2.15%, 2.2%, 2.25%, 2.3%, 2.35%, 2.4%, or 2.45%, and specific point values between the above point values, limited in space and for brevity, the invention is not intended to be exhaustive list of the specific point values included in the range.
In a preferred embodiment, the Bleached Kraft Pulp (BKP) has an average fiber length of 2.48mm and a fiber fibrillation rate of 2.207%.
Preferably, the bark pulp is paper mulberry bark pulp, which is pulp prepared by taking paper mulberry bark as a raw material and pulping by an alkaline method; the paper mulberry bark has relatively good fiber morphology, and the longer fibers enable the paper to have high tearing strength, thereby being beneficial to improving the strength and modulus of the paper cone.
Preferably, the fiber length distribution of the bark pulp is 0.43-6mm, and may be, for example, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm or 5.5mm, and specific point values between the above point values, the present invention is not exhaustive of the specific point values included in the range for reasons of spread and brevity.
Preferably, the bark pulp has an average fiber length of 2.5-4mm, which may be, for example, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.5mm or 3.8mm, and specific point values between the above point values, are limited in space and for the sake of brevity the invention is not intended to be exhaustive of the specific point values comprised in the range.
Preferably, the bark pulp has a fiber fibrillation rate of 3.2-3.8%, such as 3.25%, 3.3%, 3.35%, 3.4%, 3.45%, 3.5%, 3.55%, 3.6%, 3.65%, 3.7% or 3.75%, and specific point values between the above point values, which are not exhaustive list of the specific point values included in the range for reasons of brevity and conciseness.
In a preferred technical scheme, the average length of the fibers of the bark pulp is 3.16mm, and the fibrillation rate of the fibers is 3.544%.
Preferably, the average length of the fibers of the slurry is 10-30mm, for example, 16mm, 18mm, 20mm, 22mm, 25mm or 28mm, and the specific point values between the above point values are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range, and further preferably 15-20mm.
Preferably, the hemp pulp has a fiber aspect ratio of 800-1300, such as 850, 900, 950, 1000, 1050, 1100, 1150, 1200 or 1250, and specific point values between the above points, which are not exhaustive in the present invention for brevity and conciseness.
Preferably, the average length of the bamboo fibers is 15-50mm, for example, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 42mm or 48mm, and specific point values between the above point values, are limited in length and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the ultra-long fiber rate (mass percentage of the fibers not less than 90 mm) of the bamboo fibers is 1% -15%, for example, may be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, and specific point values among the above point values, which are limited in length and for brevity, the present invention is not exhaustive.
Preferably, the short fiber ratio of the bamboo fiber (< 15mm fiber mass percent) is 1% -15%, for example, may be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, and specific point values among the above point values, and the present invention is not exhaustive of the specific point values included in the range for reasons of space and for reasons of brevity.
Preferably, the linear density of the bamboo fibers is less than or equal to 2.5tex, for example, 0.5tex, 0.8tex, 1tex, 1.2tex, 1.5tex, 1.8tex, 2tex, 2.2tex or 2.4tex, and specific point values among the above point values, which are limited in space and for brevity, the present invention is not exhaustive.
Preferably, the breaking strength of the bamboo fibers is equal to or greater than 2Cn/dtex, for example, 2.2Cn/dtex, 2.3Cn/dtex, 2.5Cn/dtex, 2.7Cn/dtex, 2.8Cn/dtex or 3Cn/dtex, and specific point values between the above point values, are limited in space and for brevity, the present invention is not exhaustive list of specific point values included in the range, and more preferably 2-3Cn/dtex.
Preferably, the moisture content of the bamboo fibers is less than or equal to 10%, for example, may be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9% or 9.5%, and specific point values between the above point values, which are limited in space and for the sake of brevity, the present invention is not exhaustive to list the specific point values included in the range, and more preferably 5% -10%.
As a preferable technical scheme of the invention, the bamboo fiber has uniform color, no metal foreign matters and no foreign matters, has a cellulose I type crystal structure, has good heat stability, high crystallinity and compact macromolecular arrangement, and is obviously different from the cellulose II type crystal structure of the conventional bamboo pulp or bamboo fiber (the molecular structure of the bamboo pulp or bamboo fiber is damaged in the pulping process, so that the crystallinity is low, and the bamboo pulp or bamboo fiber belongs to the cellulose II type crystal structure with sparse macromolecular arrangement). Meanwhile, the bamboo fiber has higher breaking strength, lower water content and proper fiber length, and the cavity structure inside the bamboo fiber is kept more complete. The specific crystal structure, fiber structure and properties enable the bamboo fiber to have more obvious advantages in the aspects of reducing the density of the cone and improving the tone quality and the auditory sense of the cone.
Preferably, the viscosity of the chitosan is less than 200mpa·s, for example, 80mpa·s, 100mpa·s, 120mpa·s, 150mpa·s or 180mpa·s, and specific point values between the above point values, limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values comprised in the range.
Preferably, the deacetylation degree of the chitosan is more than or equal to 95%.
Preferably, the preparation raw material further comprises an acidic compound.
Preferably, the acidic compound comprises any one or a combination of at least two of formic acid, acetic acid, hydrochloric acid, lactic acid.
Preferably, the mass ratio of the acidic compound to chitosan is (0.1-2): 1, for example, it may be 0.2:1, 0.3:1, 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, or 1.8:1, etc.
In a second aspect, the present invention provides a method for preparing a speaker cone according to the first aspect, the method comprising:
mixing bleached sulfate wood pulp, bark pulp and hemp pulp, and pulping to obtain a component A; pulping the bamboo fiber to obtain a component B;
mixing the component A and the component B to obtain a fiber suspension;
uniformly mixing the fiber suspension with chitosan aqueous solution, and filtering to obtain a cone wet blank;
carrying out hot press molding on the wet paper cone blank to obtain a paper cone blank;
and punching the cone blank to obtain the loudspeaker cone.
Because the bamboo fibers are longitudinally provided with transverse knots and are uneven in length and thickness distribution, when the paper cone is directly prepared from the bamboo fibers, the bamboo fibers are easy to agglomerate, and the bamboo fibers are unevenly distributed in the paper cone, so that the performance of the paper cone is unstable. According to the preparation method of the loudspeaker cone, the bamboo fiber is pulped independently, and the average length and the dispersibility of the bamboo fiber in the obtained component B can meet the preparation requirements of the high-performance cone, so that the cone has a good improvement effect on the performance and stability. In addition, the degree of fibrillation of the bamboo fibers in the component B after pulping treatment is improved, the binding force with bleached sulfate wood pulp, bark pulp and hemp pulp is enhanced, and the component B has better interaction effect with chitosan, thereby being beneficial to further improving the strength and the comprehensive performance of the loudspeaker cone.
Preferably, the bleached kraft pulp, bark pulp and hemp pulp are mixed and pulped to a pulp consistency of 1.1% -1.8%, such as 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45%, 1.5%, 1.55%, 1.6%, 1.65%, 1.7% or 1.75%, and specific point values between the above point values, and the present invention is not intended to be exhaustive list of specific point values included in the range, more preferably 1.5% -1.6%, for reasons of brevity and conciseness.
Preferably, the component A has a degree of tapping of 20-30 SR, which may be, for example, 21 SR, 22 SR, 23 SR, 24 SR, 25 SR, 26 SR, 27 SR, 28 SR, 29 SR, and specific point values between the above point values, are limited in length and for the sake of brevity, the invention is not intended to be exhaustive of the specific point values comprised by the range.
Preferably, the beating of the bamboo fibers is performed by a groove-type beating machine.
Preferably, the pulp consistency of the bamboo fiber pulp is 0.3% -1%, for example, may be 0.4%, 0.5%, 0.6%, 0.7%, 0.8% or 0.9%, and specific point values between the above point values, which are limited in space and for simplicity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the clearance between the fly cutter and the bed cutter in the beating process of the bamboo fibers is 0.05-0.2mm, for example, may be 0.08mm, 0.1mm, 0.12mm, 0.15mm or 0.18mm, and specific point values among the above point values are limited in space and for simplicity, the present invention is not exhaustive list of specific point values included in the range.
Preferably, the component B has a degree of tapping of 18-26 SR, which may be, for example, 19 SR, 20 SR, 21 SR, 22 SR, 23 SR, 24 SR or 25 SR, and specific point values between the above point values, is limited in space and for the sake of brevity, the invention is not intended to be exhaustive of the specific point values comprised by the range.
As a preferable technical scheme of the invention, the mixed pulping of the bleached sulfate wood pulp, the bark pulp and the hemp pulp adopts a conventional pulping concentration and process, and the pulp concentration is preferably 1.1-1.8%; the primary effect of the beater on the bleaching of fibers in kraft pulp, bark pulp and hemp pulp is to cut, the primary purpose being to change the average length of the fibers. When the bamboo fibers are pulped independently, the specific process aims to reduce the shearing action on the fibers as much as possible, ensure that the average length change of the bamboo fibers is small, mainly realize the actions of splitting, tearing and sliding the bamboo fibers through friction among the fibers, and mainly aim to improve the fibrillation degree of the bamboo fibers. Thus, the pulp concentration of the pulping of the bamboo fiber is 0.3% -1%; if the pulp consistency is too high (for example, the consistency of bleached kraft pulp, bark pulp and hemp pulp is reached), the dispersibility of the bamboo fibers is poor, and phenomena such as entanglement, interlacing, aggregation and the like are generated.
As a preferable technical scheme of the invention, a specific beating process is adopted to carry out beating treatment on the bamboo fibers, and the clearance between the fly cutter and the bed knife is controlled to be 0.05-0.2mm, so that the fly cutter and the bed knife cut less bamboo fibers in the beating process, and the fibers are mainly rubbed with each other, thereby improving the degree of fibrillation of the bamboo fibers; the beating degree (beating degree) of the treated component B is 18-26 DEG SR, at the moment, the average length and the dispersibility of the bamboo fiber can meet the preparation requirement of the high-performance cone, and the specific beating process has better improvement effect on the performance and the stability of the cone. In addition, the degree of fibrillation of the bamboo fibers subjected to pulping treatment is improved, the binding force with BKP, bark pulp and hemp pulp is enhanced, and the strength of the paper cone is further improved.
Preferably, the fiber suspension is obtained by mixing the component a and the component B and then diluting with water.
Preferably, the chitosan aqueous solution comprises a combination of chitosan, an acidic compound and water.
Preferably, the mass ratio of chitosan to water is 1 (90-100), and can be 1:91, 1:92, 1:93, 1:94, 1:95, 1:96, 1:97, 1:98 or 1:99, for example.
Preferably, the preparation method of the chitosan aqueous solution comprises the following steps: dispersing chitosan in water, adding an acidic compound until the chitosan is dissolved, and obtaining the chitosan aqueous solution.
Preferably, the acidic compound comprises any one or a combination of at least two of formic acid, acetic acid, hydrochloric acid and lactic acid, and further preferably acetic acid.
Preferably, the mass ratio of the acidic compound to chitosan is (0.1-2): 1, for example, it may be 0.2:1, 0.3:1, 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, or 1.8:1, etc.
Preferably, the hot press molding method specifically includes: and placing the paper cone wet blank in a high-temperature die, and squeezing and drying to obtain the paper cone blank.
Preferably, the hot press forming temperature is 150-200 ℃, for example 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃ or 195 ℃, and specific point values between the above point values, which are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the punching method specifically comprises the following steps: and removing the middle holes and the rim charge of the cone blank by adopting a punching die to obtain the loudspeaker cone.
Preferably, the preparation method specifically comprises the following steps:
mixing bleached sulfate wood pulp, bark pulp and hemp pulp, and pulping to obtain a component A with a beating degree of 20-30 DEG SR;
pulping the bamboo fibers, wherein the pulp concentration of the pulping is 0.3% -1%, and the gap between the fly cutter and the bed cutter is 0.05-0.2mm, so as to obtain a component B with the beating degree of 18-26 DEG SR;
dispersing chitosan in water to make the mass ratio of chitosan to water be 1 (90-100), adding acid compound into the chitosan until the chitosan is dissolved so as to obtain chitosan water solution;
mixing the component A and the component B and adding water for dilution to obtain a fiber suspension;
uniformly mixing the fiber suspension with chitosan aqueous solution, and filtering to obtain a cone wet blank;
placing the paper cone wet blank in a high-temperature mould, and performing hot press forming at 150-200 ℃ to obtain a paper cone blank;
and removing the middle holes and the rim charge of the cone blank by adopting a punching die to obtain the loudspeaker cone.
In a third aspect, the present invention provides a loudspeaker comprising a loudspeaker cone as described in the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the loudspeaker cone, the bleached sulfate wood pulp, the bark pulp, the hemp pulp, the bamboo fiber and the chitosan are matched with each other in specific dosage, the fibers with different characteristics have synergistic effect and/or complementary performance, and the components have synergistic effect, so that the intensity of the cone can be effectively improved, the density is reduced, the Young modulus of the loudspeaker cone is high, the density is low, the frequency corresponding range of a loudspeaker is widened, and the sensitivity of the loudspeaker is improved; meanwhile, the loudspeaker cone has moderate internal damping, can restrain the split vibration of the cone, enables the loudspeaker to have flatter frequency response characteristic, and improves the medium-low frequency tone quality of the loudspeaker.
(2) The loudspeaker cone provided by the invention belongs to a natural fiber composite cone, on one hand, the use of natural fibers can reduce the consumption of needle wood fibers; on the other hand, BKP, bark pulp and hemp pulp are all white paper pulp, and the speaker cone prepared by compounding the white paper pulp and the bamboo fiber has special appearance different from that of a common cone.
(3) The Young modulus of the loudspeaker cone is 4.9-6.7GPa, and the density is 0.51-0.74g/cm through the design, compounding and the optimization of the preparation process of the components 3 The loss factor is 0.042-0.085, has low density, high Young's modulus, proper internal damping and higher stability, and is a loudspeaker cone with excellent comprehensive performance.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
In the following specific embodiments of the present invention, specific information of materials used is as follows:
(1) Bleached kraft pulp: BKP, purchased from Guangzhou City rhyme Qie electroacoustic technology development Co.
(2) Bark pulp: purchased from Guangzhou city rhyme and Qie electroacoustic technology development Co.
(3) Hemp pulp: the average length was 18mm and the fiber aspect ratio was 1100, purchased from Guangzhou City rhyme and Qie electroacoustic technology development Co.
(4) Bamboo fiber: the mass average length is 15-50mm, the ultra-long fiber rate (the mass percentage of the fiber is more than or equal to 90 mm) is 10%, the short fiber rate (the mass percentage of the fiber is less than 15 mm) is 10%, the linear density is less than or equal to 2.5tex, the breaking strength is more than or equal to 2Cn/dtex, the water content is less than or equal to 10%, and the color is uniform, and the fiber has no metallic foreign matters and no foreign matters; purchased from Sichuan long Shengsheng New Material technology Co.
(5) Chitosan: low-viscosity chitosan (< 200 mPa.s) was purchased from Shanghai Ala Biochemical technologies Co., ltd.
Example 1
The preparation raw materials of the loudspeaker cone comprise the following components in parts by mass:
the preparation method of the loudspeaker cone specifically comprises the following steps:
(1) Mixing BKP, bark pulp and hemp pulp, pulping to obtain a component A with beating degree of 25 DEG SR, wherein the pulping concentration is 1.57%;
pulping the bamboo fiber by a groove type pulping machine, wherein the pulp concentration is 0.5%, and the clearance between the fly cutter and the bed cutter is 0.1mm, so as to obtain a component B with 18-degree SR;
dispersing chitosan in water to make the mass ratio of chitosan to water be 1:90, dropwise adding glacial acetic acid until dissolving (the mass ratio of glacial acetic acid to chitosan is 1:5), and obtaining chitosan aqueous solution;
(2) Mixing the component A and the component B obtained in the step (1), and diluting with water to obtain a fiber suspension; mixing the fiber suspension with chitosan water solution, uniformly stirring, and filtering to obtain a cone wet blank;
(3) Placing the wet paper cone blank obtained in the step (2) into a high-temperature die for hot press molding, controlling the temperature to be 180 ℃, and squeezing and drying to obtain a paper cone blank;
(4) And (3) punching the cone blank obtained in the step (3) by adopting a punching die, and removing the mesopores and the rim charge to obtain the loudspeaker cone.
Examples 2 to 9, comparative examples 1 to 5
A speaker cone differing from example 1 only in the amount and/or degree of beating of the components, as specifically shown in table 1, wherein "-" represents that the components were not added; the speaker cone was prepared in the same manner as in example 1.
TABLE 1
Example 10
A speaker cone is different from example 1 only in that when bamboo fibers are beaten in step (1), the clearance between the fly cutter and the bed cutter of the trough beater is 0mm, and the components and other preparation steps are the same as those of example 1.
Comparative example 6
A speaker cone differs from example 1 only in that the bamboo fibrils were replaced with equal mass straw fibers (unbleached straw fibers, available from Jinan Lezhi Jizhi electronic commerce Co., ltd.) and the other components, amounts and preparation methods were the same as in example 1.
Comparative example 7
The speaker cone is different from example 1 only in that step (1) of dispersing chitosan in water without adding glacial acetic acid to obtain chitosan water suspension; the components and other preparation steps were the same as in example 1.
Comparative example 8
A speaker cone differs from example 1 only in that the bamboo fibers were replaced with equal quality bamboo pulp (unbleached bamboo pulp, available from Guangzhou Chen rhyme Qie electroacoustic technology development Co., ltd., initial freeness 15 DEG SR, and pulped to 18 DEG SR in a pulper as component B), and the other components, amounts and preparation methods were the same as in example 1.
Comparative example 9
The speaker cone is different from the embodiment 1 only in that, in the step (1), bamboo fiber, BKP, bark pulp and hemp pulp are mixed and pulped together to obtain paper pulp with a beating degree of 25 DEG SR; the components, amounts and other preparation steps were the same as in example 1.
The speaker cone provided in examples 1 to 10 and comparative examples 1 to 9 were subjected to performance test as follows:
(1) Density: the method comprises the steps that a mass/volume method is adopted, the mass of a cone is measured through an electronic balance, the thickness of the cone is measured through a micrometer, and the volume of the cone is calculated through a 3D model of the cone;
(2) Young's modulus: the Young's modulus of the cone is tested by a material parameter testing module (MPM) in KLIPPEL R & D SYSTEM for representing the strength of the cone;
(3) Loss factor: the loss factor of the cone is tested by adopting a material parameter testing module (MPM) in the KLIPPEL R & D SYSTEM for representing the damping of the cone;
the test results are shown in table 2:
TABLE 2
/>
As can be seen from the test data in Table 2, the invention can effectively improve the strength of the cone, reduce the density and have proper internal damping by mutually matching bleached sulfate wood pulp, bark pulp, hemp pulp, bamboo fiber and chitosan, mutually synergizing/complementarily complementing the fibers with different characteristics, and synergizing the components, so that the Young modulus of the cone of the loudspeaker provided in examples 1-5 is 4.9-6.7GPa and the density is 0.51-0.74g/cm 3 The loss factor is 0.042-0.085, and has the advantages of low density, high Young's modulus, proper internal damping and higher stability.
According to the invention, through the use amount of the bamboo fiber and the design and optimization of the pulping process, the bamboo fiber can be uniformly dispersed in the cone, and has stronger binding force with other components, so that the cone of the loudspeaker maintains excellent balance effect among the properties of low density, high strength and suitability for internal damping.
As is clear from the comparison between the examples 1 and 6, when the amount of the added bamboo fibers is too large, the bamboo fibers are flocculated during dispersion, which results in uneven dispersion of the bamboo fibers in the cone and further results in a decrease in the intensity of the cone; as is clear from the comparison between example 1 and example 7, the density of the cone increases when the amount of the bamboo fibers added is too small.
As can be seen from the comparison between the embodiment 1 and the embodiment 8, if the beating degree of the bamboo fiber is too low in the beating process, the length difference of the bamboo fiber is large, the degree of fibrillation is low, and the strength of the cone is reduced; as is clear from a comparison between example 1 and example 9, when the degree of beating of the bamboo fibers is too high, the hollow structure of the bamboo fibers is broken, resulting in an increase in the density of the cone.
As is clear from the comparison between the embodiment 1 and the embodiment 10, when the bamboo fibers are beaten, the gap between the fly cutter and the bed cutter of the trough beater is reduced to 0mm, and at this time, the shearing action of the bamboo fibers is enhanced, the fiber length is shortened, but the degree of fibrillation is reduced, and the loss factor of the cone is reduced, so that the internal damping performance cannot meet the requirements.
In the loudspeaker cone provided by the invention, the combination of bleached sulfate wood pulp, bark pulp, hemp pulp, bamboo fiber and chitosan is adopted as a preparation raw material, and fibers with different characteristics are complementary through synergistic effect and/or performance and are compounded with the chitosan, so that the loudspeaker cone has high strength and Young modulus, small density and proper internal damping characteristic.
As is clear from comparative examples 1 to 5, if any of the raw materials of bleached sulfate wood pulp (BKP), bark pulp, hemp pulp, bamboo fibers and chitosan is absent in the cone, the cone performance cannot be considered to be high in modulus, low in density and suitable in damping.
As can be seen from a comparison of example 1 and comparative example 6, other natural fibers, such as straw fibers, have a lower young's modulus for the cone when applied to the speaker cone.
As is clear from the comparison between the example 1 and the comparative example 7, if the acidic compound is not added, the chitosan is not dissolved in water to form an aqueous solution, the binding force between the undissolved chitosan and the plant fiber is poor, and most of the chitosan is lost with water in the step (2), thereby causing the Young's modulus of the cone to be reduced.
As is apparent from the comparison between example 1 and comparative example 8, the molecular structure of the bamboo pulp is damaged during pulping, and the bamboo pulp has no hollow structure, so that when the bamboo pulp with equal quality is used for replacing the bamboo fiber to prepare the speaker cone, the density of the cone is obviously increased, the loss factor is reduced, and the sound quality and the hearing feel are obviously deteriorated.
As can be seen from the comparison between the example 1 and the comparative example 9, the bamboo fibers, BKP, bark pulp and hemp pulp are mixed and pulped together, and under the conventional pulping process, the dispersion of the bamboo fibers is poor due to the high pulp concentration, and phenomena such as winding, interweaving and aggregation can be generated; in addition, the effect on the fibers under the conventional pulping process is to cut off and change the average length of the fibers, the length of the bamboo fibers after mixed pulping is reduced, but the fibrillation degree is not improved, so that the improvement effect on the paper cone performance is poor; because of different fiber forms and performances, the bamboo fiber, BKP, bark pulp and hemp pulp can not reach the state which is most suitable for papermaking paper cone at the same time, so that the performance of the paper cone can not be considered to be high in modulus, low in density and suitable in damping.
The applicant states that the invention has been described by way of the above examples of loudspeaker cone and its method of manufacture and application, but the invention is not limited to, i.e. it is not meant that the invention must be practiced in dependence upon the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (10)
1. The loudspeaker cone is characterized by comprising the following raw materials in parts by mass:
2. the loudspeaker cone as claimed in claim 1, wherein the raw materials for preparing the loudspeaker cone comprise the following components in parts by mass:
3. loudspeaker cone according to claim 1 or 2, characterized in that the average length of the fibres of the hemp pulp is 10-30mm, preferably 15-20mm;
preferably, the hemp pulp has a fiber aspect ratio of 800-1300;
preferably, the average length of the bamboo fibrils is 15-50mm;
preferably, the linear density of the bamboo fibrils is less than or equal to 2.5tex;
preferably, the breaking strength of the bamboo fiber is more than or equal to 2Cn/dtex;
preferably, the water content of the bamboo fiber is less than or equal to 10 percent.
4. A loudspeaker cone according to any one of claims 1-3, wherein the chitosan has a viscosity < 200 mPa-s;
preferably, the preparation raw material further comprises an acidic compound;
preferably, the acidic compound comprises any one or a combination of at least two of formic acid, acetic acid, hydrochloric acid and lactic acid;
preferably, the mass ratio of the acidic compound to chitosan is (0.1-2): 1.
5. A method of manufacturing a speaker cone according to any one of claims 1 to 4, comprising:
mixing bleached sulfate wood pulp, bark pulp and hemp pulp, and pulping to obtain a component A; pulping the bamboo fiber to obtain a component B;
mixing the component A and the component B to obtain a fiber suspension;
uniformly mixing the fiber suspension with chitosan aqueous solution, and filtering to obtain a cone wet blank;
carrying out hot press molding on the wet paper cone blank to obtain a paper cone blank;
and punching the cone blank to obtain the loudspeaker cone.
6. The method of claim 5, wherein the component a has a tapping degree of 20-30 ° SR;
preferably, the pulp concentration of the bamboo fiber beating is 0.3% -1%;
preferably, the clearance between the fly cutter and the bed knife in the beating process of the bamboo fiber is 0.05-0.2mm;
preferably, the component B has a tapping degree of 18-26 SR;
preferably, the fiber suspension is obtained by mixing the component a and the component B and then diluting with water.
7. The method of claim 5 or 6, wherein the aqueous chitosan solution comprises a combination of chitosan, an acidic compound, and water;
preferably, the mass ratio of the chitosan to the water is 1 (90-100);
preferably, the preparation method of the chitosan aqueous solution comprises the following steps: dispersing chitosan in water, adding an acidic compound until the chitosan is dissolved, and obtaining the chitosan aqueous solution.
8. The method according to any one of claims 5 to 7, wherein the hot press molding method specifically comprises: placing the cone wet blank in a high-temperature die, squeezing and drying to obtain a cone blank;
preferably, the temperature of the hot press molding is 150-200 ℃;
preferably, the punching method specifically comprises the following steps: and removing the middle holes and the rim charge of the cone blank by adopting a punching die to obtain the loudspeaker cone.
9. The preparation method according to any one of claims 5 to 8, characterized in that it comprises in particular:
mixing bleached sulfate wood pulp, bark pulp and hemp pulp, and pulping to obtain a component A with a beating degree of 20-30 DEG SR;
pulping the bamboo fibers, wherein the pulp concentration of the pulping is 0.3% -1%, and the gap between the fly cutter and the bed cutter is 0.05-0.2mm, so as to obtain a component B with the beating degree of 18-26 DEG SR;
dispersing chitosan in water to make the mass ratio of chitosan to water be 1 (90-100), adding acid compound into the chitosan until the chitosan is dissolved so as to obtain chitosan water solution;
mixing the component A and the component B and adding water for dilution to obtain a fiber suspension;
uniformly mixing the fiber suspension with chitosan aqueous solution, and filtering to obtain a cone wet blank;
placing the paper cone wet blank in a high-temperature mould, and performing hot press forming at 150-200 ℃ to obtain a paper cone blank;
and removing the middle holes and the rim charge of the cone blank by adopting a punching die to obtain the loudspeaker cone.
10. A loudspeaker, characterized in that the loudspeaker comprises a loudspeaker cone according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311095132.2A CN116887150A (en) | 2023-08-29 | 2023-08-29 | Loudspeaker cone and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311095132.2A CN116887150A (en) | 2023-08-29 | 2023-08-29 | Loudspeaker cone and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116887150A true CN116887150A (en) | 2023-10-13 |
Family
ID=88268402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311095132.2A Pending CN116887150A (en) | 2023-08-29 | 2023-08-29 | Loudspeaker cone and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116887150A (en) |
-
2023
- 2023-08-29 CN CN202311095132.2A patent/CN116887150A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10240288B2 (en) | Method of producing microfibrillated cellulose | |
| CN111188224B (en) | Myopia-preventing paper and preparation method thereof | |
| US20160273165A1 (en) | Method for improving strength and retention, and paper product | |
| CA2811380C (en) | Method for improving the removal of water | |
| JP2008169497A (en) | Method for producing nanofiber, and nanofiber | |
| JP2012057285A (en) | Fine vegetable fiber-containing paper sheet | |
| JP2014506634A (en) | Method for improving strength and yield, and paper product | |
| CN110904735B (en) | Method for making bamboo pulp household paper and household paper | |
| US11814794B2 (en) | Cellulose fiber molded product and method for manufacturing the same | |
| US20240128587A1 (en) | Alkaline battery separators having controlled pore size | |
| CN111510845A (en) | Paper cone for loudspeaker and preparation method and application thereof | |
| CN112878089A (en) | Preparation method of high-breaking-resistance kraft paper | |
| JP2013076177A (en) | Nonwoven fabric, method for producing the same and method for enhancing gas permeability of the same | |
| CN116887150A (en) | Loudspeaker cone and preparation method and application thereof | |
| Kumar et al. | Comparative study of cellulose nanofiber blending effect on properties of paper made from bleached bagasse, hardwood and softwood pulps | |
| CN110924228B (en) | Light green non-heat-sealing type tea filter paper and preparation method thereof | |
| JP2017174928A (en) | Separator for solid electrolytic capacitor | |
| RU2531254C2 (en) | Method of producing paper | |
| JP3125475B2 (en) | Newsprint | |
| CN116887151A (en) | Paper cone, preparation method thereof and loudspeaker comprising paper cone | |
| JP3989269B2 (en) | Bulky paper | |
| CN114808537B (en) | Preparation method of household paper and household paper | |
| CN201746739U (en) | Chlorine free insulation paper producer | |
| RU2043445C1 (en) | Method of aramide paper making | |
| JP2006037330A (en) | Soft cell fiber-containing paper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |