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Loudspeaker diaphragm of bacteria cellulose

A bacterial cellulose and acoustic technology, applied in sensors, microorganisms, electrical components, etc., can solve the problems of limited application, low Young's modulus, low internal damping, etc., and achieve low price, excellent performance, high tensile strength. Effect

Inactive Publication Date: 2009-02-11
许春元 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each type of diaphragm has its own characteristics. For example, the metal diaphragm in the non-paper system has a high Young's modulus, but its internal damping is small and its density is high, which limits its wide application; while most of the paper-based diaphragms Although the membrane has high internal damping, the Young's modulus is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1. A bacterial cellulose sound diaphragm, which is prepared by bacterial cellulose, and its preparation method steps are as follows: take the activated Acetobacter xylinum strain and insert it into the seed culture solution, and use 120r min -1 After 12 hours of vibrating culture in a constant temperature shaker at 30°C, the seed liquid was inserted into the fermentation medium with an inoculation amount of 10%, and shaken well; the fermentation liquid was moved to a container, and the constant temperature and static culture was cultivated at 30°C for 7 days. The formed surface film; take out the surface film and soak it in a 60°C water bath for 3 hours with lye with a mass concentration of 4%, then rinse the remaining lye in the film with deionized water until neutral, and dry it in an ordinary oven at 80°C for 18h Make a film.

Embodiment 2

[0024] Example 2. A bacterial cellulose acoustic diaphragm, which is prepared by bacterial cellulose, and its preparation method steps are as follows: take the activated Acetobacter xylinum strain and insert it into the seed culture solution, and use 100r min -1 , after 24 hours of shaking culture in a constant temperature shaker at 28°C, put the seed liquid into the fermentation medium with an inoculation amount of 8%, and shake it well; move the fermentation liquid into a container, and culture it statically at a constant temperature of 28°C for 10 days. Formed surface film; take out the surface film and soak it in 80°C water bath for 2 hours with lye with a mass concentration of 6%, then rinse the remaining lye in the film with deionized water until neutral, and dry it in an ordinary oven at 60°C for 28 hours Make a film.

Embodiment 3

[0025] Example 3. A bacterial cellulose sound diaphragm, which is prepared by bacterial cellulose, and its preparation method steps are as follows: take the activated Acetobacter xylinum strain and insert it into the seed culture solution, and use 90r·min -1 , after 10 hours of shaking culture in a constant temperature shaker at 32°C, put the seed liquid into the fermentation medium with an inoculation amount of 15%, and shake it well; move the fermentation liquid into a container, and culture it statically at a constant temperature of 32°C for 9 days. Formed surface film; after taking out the surface film, soak it in lye with a mass concentration of 3% in a water bath at 80°C for 2 hours, then rinse the remaining lye in the film with deionized water until it is neutral, and dry it in an ordinary oven at 100°C for 12 hours Make a film.

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Abstract

The invention is a bacterial cellulose acoustic vibration film. The vibration film is characterized in that the manufacturing method of the vibration film comprises the following steps of inoculating Acetobacter xylinum strains into a culture fluid; inoculating the strain liquid to a ferment culture fluid and shaking up after homothermal shake cultivation is conducted for the strains; moving the ferment liquid to a container; and conducting homothermal and static cultivation for a plurality of days until a surface film is formed on the surface of the ferment liquid; or moving the ferment liquid to a shaker; conducting homothermal and static cultivation; processing the bacterial cellulose by using lye with the mass concentration in the range of 1% to 8% after the bacterial cellulose is taken out; washing out the remained lye in the film with deionized water to achieve neutrality; and drying with an oven or heat-pressing, processing and shaping to get the film. The invention has the advantages of simple manufacturing method, good mechanical properties, and high thermal stability. The invention has the basic properties of an excellent acoustic vibration film as well as high rate modulus of elasticity and relatively large dissipation factors. In addition, the invention is durable and environmental friendly as the film can realize self-biodegradation.

Description

technical field [0001] The invention relates to an acoustic diaphragm, in particular to a bacterial cellulose acoustic diaphragm. Background technique [0002] The diaphragm is the main part of the speaker's sound, which determines the effective frequency range, distortion and sound quality of the speaker. The performance of the diaphragm depends on the geometric shape of the diaphragm, the material and processing technology of the diaphragm. The objective indicators such as the frequency response curve of the speaker are mainly determined by the geometry of the diaphragm, while the subjective indicators such as the sound quality and sense of hearing of the speaker are mainly determined by the material of the diaphragm. The basic requirements for the diaphragm have the following three points in terms of physical characteristics: in order to make the speaker playback frequency band as wide as possible, the specific elastic rate E / ρ is required to be as large as possible; the...

Claims

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Application Information

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IPC IPC(8): H04R31/00C12P19/04C12R1/02
Inventor 许春元孙东平
Owner 许春元
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