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Loudspeaker Flat Diaphragm Made of Plant Fiber Reinforced Polypropylene Composite

A plant fiber and composite material technology, applied in the direction of flat diaphragm, diaphragm structure, etc., can solve the problems of poor sound effect and increased distortion of speakers, and achieve the effects of sufficient raw material supply, reduced density, and good mechanical and physical properties.

Inactive Publication Date: 2011-12-28
马春彪 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a loudspeaker flat diaphragm made of plant fiber reinforced polypropylene composite material to solve the problems of poor sound effect and increased distortion of the loudspeaker

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] It is composed of raw materials in the following mass percentages:

[0025] Polypropylene resin: 90%;

[0026] Bamboo fiber diameter 5mm, length 2mm: 9%;

[0027] Nano calcium carbonate particles with an average diameter of 20nm: 1%;

[0028] The manufacturing method of the loudspeaker plate diaphragm that plant fiber reinforced polypropylene composite material of the present invention makes comprises the following steps:

[0029] (1) According to the formula ratio, the polypropylene resin, bamboo fiber and nano-calcium carbonate particles are sent into the mixer and mixed evenly, and then pressed into the blank of the required shape by the press molding machine;

[0030] (2) Put the blank into a special honeycomb cell foaming molding device, heat the device to 120°C and turn the screw inside the device, the blank is heated and melted and plasticized to form the matrix of the diaphragm, and the high-pressure carbon dioxide Gas is injected into the device, and the car...

Embodiment 2

[0033] It is composed of raw materials in the following mass percentages:

[0034] Polypropylene resin: 85%;

[0035] Bamboo fiber diameter 5.25mm, length 4mm: 12%;

[0036] Nano calcium carbonate particles with an average diameter of 35nm: 3%;

[0037] The manufacturing method of the loudspeaker plate diaphragm that plant fiber reinforced polypropylene composite material of the present invention makes comprises the following steps:

[0038] (1) Send polypropylene resin, bamboo fiber and nano-calcium carbonate particles into a kneader to mix evenly according to the formula ratio, and then press it into a billet of the required shape through a press molding machine;

[0039] (2) Put the blank into a special honeycomb cell foam molding device, heat the device to 140°C and turn the screw inside the device, the blank is heated and melted and plasticized to form the matrix of the diaphragm, and the high-pressure carbon dioxide The gas is injected into the device, and the pressur...

Embodiment 3

[0042] It is composed of raw materials in the following mass percentages:

[0043] Polypropylene resin: 80%;

[0044] Bamboo fiber diameter 5.5mm, length 6mm: 15%;

[0045] Nano calcium carbonate particles with an average diameter of 50nm: 5%;

[0046] The manufacturing method of the loudspeaker plate diaphragm that plant fiber reinforced polypropylene composite material of the present invention makes comprises the following steps:

[0047] (1) Send polypropylene resin, bamboo fiber and nano-calcium carbonate particles into a kneader to mix evenly according to the formula ratio, and then press it into a billet of the required shape through a press molding machine;

[0048] (2) Put the blank into a special honeycomb cell foam molding device, heat the device to 160°C and turn the screw inside the device, the blank is heated and melted and plasticized to form the matrix of the diaphragm, and the high-pressure carbon dioxide Gas is injected into the device, the carbon dioxide g...

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PUM

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Abstract

The invention relates to a speaker flat plate diaphragm made of a vegetable fiber reinforced polypropylene composite material and belongs to the field of design and manufacturing of an electroacoustic device and an audio electronic product. The speaker flat plate diaphragm comprises the following raw materials in percentage by mass: 80 percent to 90 percent of polypropylene resin, 9 percent to 15percent of vegetable fibers and 1 percent to 5 percent of nano inorganic additive. The speaker flat plate diaphragm has the beneficial effects that the adopted polypropylene resin raw material is supplied sufficiently and has low cost; compared with a solid material with the same size of the speaker flat plate diaphragm, the density of the speaker flat plate diaphragm is greatly reduced; and the rigidity of the speaker flat plate diaphragm is obviously improved and is easy for mass production and performance parameter control.

Description

technical field [0001] The invention belongs to the field of design and manufacture of electro-acoustic devices and audio products, in particular to a loudspeaker diaphragm, in particular to a flat loudspeaker diaphragm with ultra-thin thickness, high specific stiffness and light weight made of a composite material using polypropylene resin as a matrix. membrane. Background technique [0002] The performance of the speaker diaphragm has a very important impact on the sound quality of the speaker. After the size and shape of the diaphragm is determined, the material and molding process of the diaphragm have a decisive impact on the performance and sound quality of the speaker. At present, the speaker diaphragm is mainly made of wood fiber or paper cone mainly made of wood fiber, which consumes a lot of forest resources, which is not conducive to environmental protection and sustainable development. [0003] In addition, traditional loudspeakers use cone-type diaphragms, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L97/02C08K3/26H04R7/04C08J9/12
Inventor 马春彪耿云瑶
Owner 马春彪
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