CN111510845A - Paper cone for loudspeaker and preparation method and application thereof - Google Patents
Paper cone for loudspeaker and preparation method and application thereof Download PDFInfo
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- CN111510845A CN111510845A CN202010269906.9A CN202010269906A CN111510845A CN 111510845 A CN111510845 A CN 111510845A CN 202010269906 A CN202010269906 A CN 202010269906A CN 111510845 A CN111510845 A CN 111510845A
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- cone
- pulp
- loudspeaker
- parts
- pulping
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Classifications
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- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/28—Organic non-cellulose fibres from natural polymers
- D21H13/34—Protein fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/38—Loudspeaker cones; Acoustic diaphragms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2207/00—Details of diaphragms or cones for electromechanical transducers or their suspension covered by H04R7/00 but not provided for in H04R7/00 or in H04R2307/00
- H04R2207/021—Diaphragm extensions, not necessarily integrally formed, e.g. skirts, rims, flanges
-
- 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
-
- 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
Abstract
The invention provides a cone for a loudspeaker and a preparation method and application thereof. The preparation raw materials of the cone for the loudspeaker comprise: unbleached kraft pulp, hemp pulp, bark pulp, wool pulp and pulping enzymes. The paper cone for the loudspeaker adopts unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp mixed pulp as main materials, and pulping enzymes are added, so that the strength and the stability of the paper cone for the loudspeaker are effectively improved; meanwhile, the internal damping of the cone for the loudspeaker is guaranteed, the tone quality of the cone for the loudspeaker is improved, and the resonant frequency is also reduced.
Description
Technical Field
The invention belongs to the technical field of electroacoustic, and particularly relates to a cone paper for a loudspeaker as well as a preparation method and application thereof.
Background
The cone is a key component of a loudspeaker vibration system, and the performance of the cone determines the effective frequency range, distortion performance and sound quality of the loudspeaker to a large extent. However, the paper material generally has the problem of insufficient rigidity, so that the loudspeaker generates segmentation vibration during high-frequency vibration, and the performance of the loudspeaker is affected. Moreover, some sounds from the existing common loudspeaker cone are not mellow in bass, not beautiful enough in mid-frequency and not transparent enough in treble, and the original sound performance of the sounds is not really displayed. Therefore, it is important to improve the rigidity of the cone.
CN102647654A discloses a reinforced cone for speaker with high structural strength and increased low frequency performance, and its manufacturing method. The method comprises the following steps: the structural sound effect reinforcing layer is formed by cutting and combining commercially available Korean paper and is provided with a plurality of holes which are different in size and are distributed randomly. The disadvantages of this approach include: a. the loudspeaker assembly process is complicated: firstly, performing gum dipping pretreatment on the structure sound effect reinforcing layer, then adhering the structure sound effect reinforcing layer on the surface of the cone, and finally performing post-treatment on the front surface of the cone, namely spraying the milky white glue diluent. b. The consistency of product performance in mass production cannot be ensured; c. the rigidity of the cone material itself is not improved.
CN105530574A discloses a high strength cone for loudspeaker, which improves the material formula of the traditional cone, and the introduced combined modified pulp effectively overcomes the defect of low moisture resistance of the cone in the prior art, so that the loudspeaker can maintain good fullness in full frequency band for a long time, thereby greatly inhibiting the distortion of the loudspeaker and improving the tone quality of the loudspeaker. However, the disadvantages of this method are: the material formula of the cone at least comprises the combination of polypropylene, poplar pulp and peach pulp. This greatly limits the choice of cone material and does not facilitate the adjustment of the tone and quality of the speaker to the actual requirements.
CN106303845A discloses a loudspeaker cone, which is composed of polyvinyl chloride, kapok fiber, pectin, styrene-butadiene latex, polyacrylamide and polyvinyl alcohol in proportion, so that the loudspeaker can maintain good fullness in full frequency band for a long time, and the sound quality of the loudspeaker is improved. However, disadvantages of this approach include: a. the plant fiber in the formula is single in type and low in content, and is not beneficial to adjusting the tone and the tone quality of the loudspeaker according to actual requirements; b. compared with the traditional cone made of plant fibers, the cone for the loudspeaker has higher cost and is not suitable for industrial production.
Therefore, it is a research focus in the field to develop a speaker cone with stable mechanical properties and sound quality to meet the application requirements of speakers.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a cone for a loudspeaker and a preparation method and application thereof. The strength and the toughness of cone for the speaker are high, and the weight of cone for the speaker is lighter, and tone quality is true and stable.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a cone for a speaker, the raw material for preparing the cone for a speaker including: unbleached kraft pulp, hemp pulp, bark pulp, wool pulp and pulping enzymes.
The prepared slurry of the cone for the loudspeaker is obtained by matching unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp, and the slurries are matched with each other and have synergy, so that the strength and the rigidity and the toughness of the cone for the loudspeaker can be improved, the stability of the cone for the loudspeaker is improved, the service life of the cone for the loudspeaker is prolonged, the stability of the structure of the cone for the loudspeaker is ensured, the fidelity of the cone for the loudspeaker is higher, and the tone quality is better. And add the making beating enzyme and can make above-mentioned each thick liquids plant fiber divide the brooming degree to improve, and then make the cohesion reinforcing between the fibre, finally reach the effect that improves the intensity of cone for the speaker, add the making beating enzyme moreover and can not change the pulp kind ratio of cone for the speaker, can not increase the weight of cone for the speaker to the at utmost reduces the influence to the speaker performance, and guarantee tone quality is stable.
The sulfate wood pulp is thick and long fiber, small in cell cavity and thick in cell wall, namely, the ratio of cell wall cavity of the fiber is large, and the fiber is hard and high in rigidity and is not easy to crush. More of its original tubular form is retained during extrusion drying and the interfiber bonding is weaker. Unbleached Kraft Pulp (UKP) is selected in the invention, and the fiber damage is less, so the toughness is good and the strength is high. The bast fiber pulp is long and tough, and the original beating degree of the bast fiber pulp is 13.5 DEG SR. The bark pulp is paper 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 form, and the long fiber ensures that the finished paper has high tearing strength, thereby creating favorable conditions for improving the strength of the cone for the loudspeaker. The wool pulp is prepared by degreasing wool, cleaning, mixing with plant fiber, and pulping. The low-frequency characteristic can be improved by adding the wool pulp into the sulfate pulp to manufacture the cone for the loudspeaker, because the proper wool-doped cone for the loudspeaker increases the internal damping of the cone for the loudspeaker, improves the sound quality of the cone for the loudspeaker and reduces the resonance frequency.
Preferably, the preparation raw materials of the cone for the loudspeaker comprise, by weight: 20-50 parts of unbleached sulfate wood pulp, 30-40 parts of hemp pulp, 10-20 parts of bark pulp, 5-20 parts of wool pulp and 0.01-0.03 part of pulping enzyme.
In the present invention, the unbleached kraft pulp may be 20 to 50 parts by weight, for example, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts, 50 parts, etc.
In the present invention, the hemp pulp is 30 to 40 parts by weight, for example, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, etc.
In the present invention, the bark pulp may be 10 to 20 parts by weight, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.
In the present invention, the weight portion of the wool pulp is 5 to 20 parts, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc.
In the present invention, the pulping enzyme may be used in an amount of 0.01 to 0.03 parts by weight, for example, 0.01 part, 0.015 part, 0.02 part, 0.025 part, 0.03 part, or the like.
Preferably, the cone beating enzyme for the loudspeaker comprises cellulase. The main component of the pulping enzyme is cellulase, and the effect is as follows: the cellulase can degrade cellulose in the cell wall of each pulp, promote the cell wall structure to be loose, increase the permeability and reduce the cohesion of the fiber. Facilitating the peeling of S1 (secondary wall outer layer). And beating mechanical force is applied during beating to further delaminate cell walls, so that cell wall destruction and devillicate brooming are accelerated, more binding sites are formed among fibers, and the aim of improving the strength of the cone for the loudspeaker is fulfilled.
Preferably, the preparation raw material of the cone for the loudspeaker also comprises a hardening agent.
Preferably, the hardening agent is added in an amount of 1 to 10 parts, and may be, for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, or the like.
Preferably, the hardening agent is SA-6077H. The hardening agent needs to be diluted by a solvent when in use so as to enhance the penetration capability of the SA-6077H resin in a cone for a loudspeaker. After the cone for the loudspeaker is soaked by the diluent of the hardening agent, the cone is resistant to solvents, acids and alkalis and high temperature, has small shrinkage ratio after hardening, high hardness and toughness and is not easy to crack.
In a second aspect, the present invention provides a method for manufacturing a cone for a speaker according to the first aspect, the method for manufacturing a cone for a speaker comprising: mixing unbleached sulfate wood pulp, hemp pulp, bark pulp, wool pulp and pulping enzyme for pulping, and then carrying out papermaking, hot pressing and punching treatment to obtain the cone for the loudspeaker.
Preferably, the pulping comprises the following specific steps: the method comprises the following steps of crushing unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp, placing the crushed pulp in a pulping machine, adding water for dilution, adding pulping enzyme, and pulping to obtain pulp.
Preferably, the degree of beating of the slurry is from 10 to 20 ° SR, and may be, for example, 10 ° SR, 11 ° SR, 12 ° SR, 13 ° SR, 14 ° SR, 15 ° SR, 16 ° SR, 17 ° SR, 18 ° SR, 19 ° SR, 20 ° SR, or the like.
Preferably, the papermaking method comprises the following specific steps: diluting the pulp obtained by beating with water to obtain a fiber suspension, and filtering the fiber suspension to obtain the cone blank for the loudspeaker.
Preferably, the hot pressing comprises the following specific steps: placing the paper-made cone blank for the loudspeaker in a high-temperature mold, and pressing and drying to obtain a cone blank for the loudspeaker;
preferably, the drying temperature is 150-190 ℃, for example, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃, 180 ℃, 185 ℃, 190 ℃ and the like, and the drying time is 5-20 s, for example, 5s, 6s, 8s, 10s, 12s, 14s, 16s, 18s, 20s and the like.
Preferably, the hot pressing further comprises infiltration, and the infiltration specifically comprises the following steps: and infiltrating the cone blank for the loudspeaker obtained by hot pressing in a diluent of a hardening agent, and drying to obtain the cone blank for the hardened loudspeaker.
Preferably, the soaking time is 1-5s, for example, 1s, 2s, 3s, 4s, 5s, etc.
Preferably, the diluent of the hardening agent comprises a hardening agent and a diluent. The hardening agent is used by diluting with toluene to enhance the penetration of the resin into the cone for speaker.
Preferably, the diluent is toluene.
Preferably, the mass ratio of the hardening agent to the diluent is (0.2-0.6):1, and may be, for example, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, and the like.
Preferably, the specific steps of punching are as follows: and (4) removing the middle hole and the rim charge of the cone blank for the loudspeaker by adopting a punching die to obtain a cone finished product for the loudspeaker.
Preferably, the preparation method of the cone for the loudspeaker specifically comprises the following steps:
(1) pulping: crushing unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp, placing the crushed pulp in a pulping machine, adding water for dilution, adding pulping enzyme for pulping to obtain pulp with the beating degree of 10-20 DEG SR;
(2) papermaking: diluting the slurry obtained in the step (1) with water to obtain a fiber suspension, and filtering the fiber suspension to obtain a cone blank for the loudspeaker;
(3) hot pressing: placing the cone blank for the loudspeaker obtained in the step (2) in a high-temperature die, squeezing, and drying at 150-190 ℃ for 5-20 s to obtain a cone blank for the loudspeaker;
(4) infiltrating: soaking the cone blank for the loudspeaker obtained in the step (3) in a hardening agent diluent for 1-5s, taking out and air-drying to obtain the cone blank for the hardened loudspeaker;
(5) punching: and (4) removing the middle hole and the rim charge of the stiffened cone blank for the loudspeaker obtained in the step (4) by using a punching die to obtain the cone for the loudspeaker.
In a third aspect, the invention provides a use of the cone for speakers as described in the first aspect in the manufacture of a speaker.
Compared with the prior art, the invention has the following beneficial effects:
(1) the cone for the loudspeaker adopts unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp mixed slurry as main materials, is used for providing rigidity and toughness of the cone for the loudspeaker, ensures the strength of the cone for the loudspeaker, has the Young modulus of more than 4.2GPa, improves the stability of the cone for the loudspeaker, prolongs the service life of the cone for the loudspeaker, ensures the stability of the structure of the cone for the loudspeaker, and increases the internal damping of the cone for the loudspeaker, thereby improving the tone quality of the cone for the loudspeaker and reducing the resonance frequency.
(2) According to the cone for the loudspeaker, the beating enzyme is added, so that the devillicate brooming degree of the plant fibers of the pulp is improved, the bonding force among the fibers is further enhanced, and the effect of improving the strength of the cone for the loudspeaker is finally achieved.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The raw material sources of the components in the following examples are as follows: pulping enzyme (cellulase, hua yan chemical industry, ltd., zhejiang province), hardening agent (SA-6077H, tai jia industrial materials, ltd.), unbleached kraft pulp (UKP, guangzhou city, yunqi electro-acoustic technology development ltd.), hemp pulp (guangzhou city, yunqi electro-acoustic technology development ltd.), bark pulp (paper mulberry pulp, guangzhou city, yunqi electro-acoustic technology development ltd.), and wool pulp (guangzhou city, yunqi electro-acoustic technology development ltd.).
Example 1
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp, 10 parts of wool pulp and 0.02 part of pulping enzyme.
The preparation method of the cone for the loudspeaker specifically comprises the following steps:
(1) pulping: shredding 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp and 10 parts of wool pulp, placing the shredded pulp into a beating machine, adding water for dilution, adding 0.02 part of beating enzyme for beating to obtain pulp with a beating degree of 15 DEG SR;
(2) papermaking: diluting the slurry obtained in the step (1) with water to obtain a fiber suspension, and filtering the fiber suspension to obtain a cone blank for the loudspeaker;
(3) hot pressing: placing the cone blank for the loudspeaker obtained in the step (2) in a high-temperature die, pressing, and drying at 170 ℃ for 10s to obtain a cone blank for the loudspeaker;
(4) punching: and (4) removing the middle hole and the rim charge of the cone blank for the loudspeaker obtained in the step (3) by adopting a punching die to obtain the cone for the loudspeaker.
Example 2
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 50 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 15 parts of bark pulp, 5 parts of wool pulp and 0.01 part of pulping enzyme. The method for manufacturing the cone for a speaker according to this embodiment is the same as that of embodiment 1.
Example 3
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 20 parts of unbleached sulfate wood pulp, 40 parts of hemp pulp, 20 parts of bark pulp, 20 parts of wool pulp and 0.03 part of pulping enzyme. The method for manufacturing the cone for a speaker according to this embodiment is the same as that of embodiment 1.
Example 4
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp, 10 parts of wool pulp, 0.02 part of pulping enzyme and 2 parts of SA-6077H hardening agent.
The preparation method of the cone for the loudspeaker specifically comprises the following steps:
(1) pulping: shredding 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp and 10 parts of wool pulp, placing the shredded pulp into a beating machine, adding water for dilution, adding 0.02 part of beating enzyme for beating to obtain pulp with a beating degree of 15 DEG SR;
(2) papermaking: diluting the slurry obtained in the step (1) with water to obtain a fiber suspension, and filtering the fiber suspension to obtain a cone blank for the loudspeaker;
(3) hot pressing: placing the cone blank for the loudspeaker obtained in the step (2) in a high-temperature die, pressing, and drying at 170 ℃ for 10s to obtain a cone blank for the loudspeaker;
(4) infiltrating: soaking the cone blank for the loudspeaker obtained in the step (3) in a hardening agent diluent (2 parts of a hardening agent and 10 parts of methylbenzene), taking out after soaking for 2 seconds, and air-drying to obtain the cone blank for the hardening loudspeaker;
(5) punching: and (4) removing the middle hole and the rim charge of the stiffened cone blank for the loudspeaker obtained in the step (4) by using a punching die to obtain the cone for the loudspeaker.
Example 5
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp, 10 parts of wool pulp, 0.02 part of pulping enzyme and 6 parts of SA-6077H hardening agent. The method for manufacturing the cone for a speaker according to this embodiment is the same as that of embodiment 4.
Example 6
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 50 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 15 parts of bark pulp, 5 parts of wool pulp, 0.01 part of pulping enzyme and 4 parts of SA-6077H hardening agent. The method for manufacturing the cone for a speaker according to this embodiment is the same as that of embodiment 4.
Example 7
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 20 parts of unbleached sulfate wood pulp, 40 parts of hemp pulp, 20 parts of bark pulp, 20 parts of wool pulp, 0.03 part of pulping enzyme and 4 parts of SA-6077H hardening agent. The method for manufacturing the cone for a speaker according to this embodiment is the same as that of embodiment 4.
Example 8
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 10 parts of unbleached sulfate wood pulp, 50 parts of hemp pulp, 20 parts of bark pulp, 20 parts of wool pulp and 0.02 part of pulping enzyme. The method for manufacturing the cone for a speaker according to this embodiment is the same as that of embodiment 1.
Example 9
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp, 10 parts of wool pulp, 0.02 part of pulping enzyme and 2 parts of dry strength agent (the dry strength agent is purchased from Dongze paper making auxiliary agent Co., Ltd., Dongguan).
The preparation method of the cone for the loudspeaker specifically comprises the following steps:
(1) pulping: shredding 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp and 10 parts of wool pulp, placing the shredded pulp into a beating machine, adding water for dilution, adding 0.02 part of beating enzyme and 2 parts of dry strength agent, and beating to obtain pulp with a beating degree of 15 DEG SR;
(2) papermaking: diluting the slurry obtained in the step (1) with water to obtain a fiber suspension, and filtering the fiber suspension to obtain a cone blank for the loudspeaker;
(3) hot pressing: placing the cone blank for the loudspeaker obtained in the step (2) in a high-temperature die, pressing, and drying at 170 ℃ for 10s to obtain a cone blank for the loudspeaker;
(4) punching: and (4) removing the middle hole and the rim charge of the cone blank for the loudspeaker obtained in the step (3) by adopting a punching die to obtain the cone for the loudspeaker.
Example 10
The embodiment provides a cone for a loudspeaker, which is prepared from the following raw materials in parts by weight: 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp, 10 parts of wool pulp, 0.02 part of pulping enzyme and 2 parts of stiffening agent (the stiffening agent is purchased from model QN-2017, Shandong Tai Anqineng).
The preparation method of the cone for the loudspeaker specifically comprises the following steps:
(1) pulping: shredding 40 parts of unbleached sulfate wood pulp, 30 parts of hemp pulp, 20 parts of bark pulp and 10 parts of wool pulp, placing the shredded pulp into a beating machine, adding water for dilution, adding 0.02 part of beating enzyme and 2 parts of stiffening agent, and beating to obtain pulp with the beating degree of 15 DEG SR;
(2) papermaking: diluting the slurry obtained in the step (1) with water to obtain a fiber suspension, and filtering the fiber suspension to obtain a cone blank for the loudspeaker;
(3) hot pressing: placing the cone blank for the loudspeaker obtained in the step (2) in a high-temperature die, pressing, and drying at 170 ℃ for 10s to obtain a cone blank for the loudspeaker;
(4) punching: and (4) removing the middle hole and the rim charge of the cone blank for the loudspeaker obtained in the step (3) by adopting a punching die to obtain the cone for the loudspeaker.
Comparative example 1
This comparative example provides a cone for speakers, which is different from example 1 only in that the raw material for the preparation of the cone for speakers does not contain a beating enzyme, and the contents of other components and the preparation method are the same as those of example 1.
Comparative example 2
This comparative example provides a cone for a speaker, which is different from example 1 only in that unbleached kraft pulp was not added to the raw materials for the preparation of the cone for a speaker, the content of hemp pulp was increased to 50 parts, the content of bark pulp was increased to 30 parts, the content of wool pulp was increased to 20 parts, and the contents of other components and the preparation method were the same as example 1.
Comparative example 3
This comparative example provides a cone for a speaker, which is different from example 1 only in that the raw materials for the preparation of the cone for a speaker are not added with hemp pulp, the content of unbleached sulfate wood pulp is increased to 50 parts, the content of bark pulp is increased to 30 parts, the content of wool pulp is increased to 20 parts, and the content of other components and the preparation method are the same as example 1.
Comparative example 4
This comparative example provides a cone for a speaker, which is different from example 1 only in that the raw materials for the preparation of the cone for a speaker do not add the bark pulp, the unbleached sulfate wood pulp content is increased to 48 parts, the hemp pulp content is increased to 36 parts, the wool pulp content is increased to 16 parts, and the other component contents and the preparation method are the same as example 1.
Comparative example 5
This comparative example provides a cone for speakers, which is different from example 1 only in that unbleached sulfate wood pulp (UKP) was replaced with bleached sulfate wood pulp (BKP), and the contents of other components and the preparation method were the same as in example 1.
Performance testing
The respective properties of the cones for speakers prepared in examples 1 to 10 and those of the cones for speakers prepared in comparative examples 1 to 5 were measured, wherein the young's modulus (this test method is referred to from "young's modulus test error analysis of cone material for speakers") was as shown in table 1:
TABLE 1
| Test sample | Young's modulus (GPa) |
| Example 1 | 4.93 |
| Example 2 | 4.86 |
| Example 3 | 5.18 |
| Example 4 | 6.41 |
| Example 5 | 6.92 |
| Example 6 | 6.56 |
| Example 7 | 6.79 |
| Example 8 | 4.29 |
| Example 9 | 5.25 |
| Example 10 | 5.28 |
| Comparative example 1 | 4.16 |
| Comparative example 2 | 4.12 |
| Comparative example 3 | 4.05 |
| Comparative example 4 | 3.84 |
| Comparative example 5 | 3.37 |
As can be seen from the test data in Table 1, the Young modulus of the cone for the loudspeaker prepared by the method is more than 4.2 GPa; the cone for the loudspeaker adopts the mixed slurry of unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp as the main material, is used for providing the rigidity and the toughness of the cone for the loudspeaker, and is added with pulping enzymes to improve the devillicate brooming degree of plant fibers, so that the bonding force between the fibers is enhanced, the strength of the cone for the loudspeaker is effectively ensured, the stability of the cone for the loudspeaker is improved, the internal damping of the cone for the loudspeaker is ensured, and the tone quality of the cone for the loudspeaker is improved. As is clear from the comparison of examples 1 to 3 and examples 4 to 7, the wet-hardening step further improved the strength of the cone for speakers. From the test data of example 8, it is found that when the compounding ratio of the slurry is out of the preferable compounding ratio range of the present invention, the young's modulus of the cone for speaker tends to be lowered, and the strength of the cone for speaker is lowered.
As is clear from comparison between example 1 and comparative example 1, the young's modulus of the cone for speaker produced by adding the beating enzyme at the beating stage is remarkably decreased because the pulp is hardly fibrillated and the pulp fibers are not sufficiently swollen by water absorption and brooming without adding the beating enzyme, and the strength and uniformity of the finished paper are decreased because the bonding force between the pulp fibers is weak. As can be seen from comparison between example 1 and comparative examples 2 to 5, the young's modulus and the loss tangent of the produced cone for speaker were reduced to various degrees in the absence of any component in the pulp, and it was confirmed that unbleached kraft pulp, hemp pulp, bark pulp and wool pulp in the cone material for speaker according to the present invention cooperate with each other to synergically enhance the strength of the cone for speaker and improve the sound quality of the cone for speaker. As is clear from comparison between example 1 and comparative example 6, the drop in young's modulus of the cone for a speaker produced by replacing unbleached sulfate wood pulp (UKP) with bleached sulfate wood pulp (BKP) is significant because the bleached sulfate wood pulp (BKP) hydrolyzes part of the cellulose during bleaching (removal of impurities), and thus the BKP has low fiber strength.
The applicant states that the present invention is described by the above embodiments, but the present invention is not limited to the above embodiments, that is, the present invention is not meant to be implemented only by relying on the above embodiments. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A cone for a loudspeaker is characterized in that the preparation raw materials of the cone for the loudspeaker comprise: unbleached kraft pulp, hemp pulp, bark pulp, wool pulp and pulping enzymes.
2. The cone for the loudspeaker of claim 1, wherein the raw materials for preparing the cone for the loudspeaker comprise, in parts by weight: 20-50 parts of unbleached sulfate wood pulp, 30-40 parts of hemp pulp, 10-20 parts of bark pulp, 5-20 parts of wool pulp and 0.01-0.03 part of pulping enzyme.
3. The cone for loudspeaker of claim 1 or 2 wherein said beating enzyme comprises cellulase.
4. The cone for a speaker as claimed in any one of claims 1 to 3, wherein the raw material for preparing the cone for a speaker further comprises a hardening agent;
preferably, the addition amount of the hardening agent is 1-10 parts;
preferably, the hardening agent is SA-6077H.
5. The method of manufacturing a cone for a speaker according to any one of claims 1 to 4, wherein the method of manufacturing a cone for a speaker is: mixing unbleached sulfate wood pulp, hemp pulp, bark pulp, wool pulp and pulping enzyme for pulping, and then carrying out papermaking, hot pressing and punching treatment to obtain the cone for the loudspeaker.
6. The preparation method according to claim 5, characterized in that the specific steps of beating are as follows: crushing unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp, placing the crushed pulp in a pulping machine, adding water for dilution, adding pulping enzyme, and pulping to obtain pulp;
preferably, the beating degree of the slurry is 10-20 ° SR;
preferably, the papermaking method comprises the following specific steps: diluting the pulp obtained by beating with water to obtain a fiber suspension, and filtering the fiber suspension to obtain the cone blank for the loudspeaker.
7. The preparation method according to claim 5 or 6, wherein the hot pressing comprises the following specific steps: placing the paper-made cone blank for the loudspeaker in a high-temperature mold, and pressing and drying to obtain a cone blank for the loudspeaker;
preferably, the drying temperature is 150-190 ℃, and the drying time is 5-20 s.
8. The preparation method according to any one of claims 5 to 7, further comprising infiltration after the hot pressing, wherein the infiltration comprises the following specific steps: soaking the cone blank for the loudspeaker obtained by hot pressing in a diluent of a hardening agent, and drying to obtain the cone blank for the hardened loudspeaker;
preferably, the soaking time is 1-5 s;
preferably, the diluent of the hardening agent comprises a hardening agent and a diluent;
preferably, the diluent is toluene;
preferably, the mass ratio of the hardening agent to the diluent is (0.2-0.6) to 1;
preferably, the specific steps of punching are as follows: and (4) removing the middle hole and the rim charge of the cone blank for the loudspeaker by adopting a punching die to obtain a cone finished product for the loudspeaker.
9. The method for manufacturing a cone for a speaker according to any one of claims 5 to 8, wherein the method for manufacturing a cone for a speaker specifically comprises the steps of:
(1) pulping: crushing unbleached sulfate wood pulp, hemp pulp, bark pulp and wool pulp, placing the crushed pulp in a pulping machine, adding water for dilution, adding pulping enzyme for pulping to obtain pulp with the beating degree of 10-20 DEG SR;
(2) papermaking: diluting the slurry obtained in the step (1) with water to obtain a fiber suspension, and filtering the fiber suspension to obtain a cone blank for the loudspeaker;
(3) hot pressing: placing the cone blank for the loudspeaker obtained in the step (2) in a high-temperature die, squeezing, and drying at 150-190 ℃ for 5-20 s to obtain a cone blank for the loudspeaker;
(4) infiltrating: soaking the cone blank for the loudspeaker obtained in the step (3) in a hardening agent diluent for 1-5s, taking out and air-drying to obtain the cone blank for the hardened loudspeaker;
(5) punching: and (4) removing the middle hole and the rim charge of the stiffened cone blank for the loudspeaker obtained in the step (4) by using a punching die to obtain the cone for the loudspeaker.
10. Use of a cone according to any of claims 1-4 for loudspeakers in the manufacture of loudspeakers.
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