bakhtiar
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Many of us here, knew that Sony MDR-R10, CD3000, CD1700,... use biocellulose as diaphragm. But not many of us knew how this biocellulose produced.
Today, I would like to share few important infos about biocellulose which I read from Japan's Audio Society journal. Although the article is focused on material used for speaker's diaphragms, but it still relevant to this topic. I wrote this translation in LaTeX, and converted to html and text before pasting it here. I am sorry if, my english used here is not so good, but I hope everyone here understand what I want to say
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Biocellulose material as diaphragm
Abstract
This is a translation of an excerpt from articles which appeared in JAS (Japan Audio Society) Journal 1991 vol 21 no.2 (February 1991). I am not responsible for any misinformation due to this translation.
Mohammad Bahathir Hashim < bakhtiar@softhome.net >
1 What is biocellulose?
Biocellulose is a cellulose produced by bacteria. Sony and co-operation with Anjinomoto; use aceto bacteria to produce cellulose fibers. Actually, there was report or research about the cellulose production by bacteria in 1886. But at that time, there was no way to study the kinetic research of the cellulose. These cellulose is same like cellulose which produced by plants, but the shape and physical specifications is different, and have a very good sound characteristic.
2 The production of cellulose
Bacteria is cultured in culture fluid with belows ingredients.
Quote:
The acidities of the mixture maintained to pH 5.0 by using hydrochloric acid
and natrium hydroxide.
The bacteria produces 0.02 - 0.05 mm of amorphous fiber which called fibroid.
After few generations of reproductions/splits, it produces unique net/cloth
like structure of fibroid. The comparison of physical characteristic between
biocellulose and pulp shown below.
Quote:
3 Biocellulose sound characteristics
Since the structure of the biocellulose sheet is different from pulp/paper, sound characteristics also different. The biggest different is how to construct or form to be a speaker's diaphragms. Normal paper cone have to went to several processes before it can be shaped. Biocellulose film however, can be form directly to the shape, without much effort and processes.
Physical characteristics comparison between processed biocellulose and other materials.
Quote:
As we can see here, biocellulose have a very high internal loss and Young's coefficient; like paper, but can transmit sound as fast as aluminium, which is near ideal sound characteristic for the speaker's diaphragm.
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p/s
I wish I could paste pictures here, but the copyrights ......
Today, I would like to share few important infos about biocellulose which I read from Japan's Audio Society journal. Although the article is focused on material used for speaker's diaphragms, but it still relevant to this topic. I wrote this translation in LaTeX, and converted to html and text before pasting it here. I am sorry if, my english used here is not so good, but I hope everyone here understand what I want to say
------
Biocellulose material as diaphragm
Abstract
This is a translation of an excerpt from articles which appeared in JAS (Japan Audio Society) Journal 1991 vol 21 no.2 (February 1991). I am not responsible for any misinformation due to this translation.
Mohammad Bahathir Hashim < bakhtiar@softhome.net >
1 What is biocellulose?
Biocellulose is a cellulose produced by bacteria. Sony and co-operation with Anjinomoto; use aceto bacteria to produce cellulose fibers. Actually, there was report or research about the cellulose production by bacteria in 1886. But at that time, there was no way to study the kinetic research of the cellulose. These cellulose is same like cellulose which produced by plants, but the shape and physical specifications is different, and have a very good sound characteristic.
2 The production of cellulose
Bacteria is cultured in culture fluid with belows ingredients.
Quote:
The acidities of the mixture maintained to pH 5.0 by using hydrochloric acid
and natrium hydroxide.
The bacteria produces 0.02 - 0.05 mm of amorphous fiber which called fibroid.
After few generations of reproductions/splits, it produces unique net/cloth
like structure of fibroid. The comparison of physical characteristic between
biocellulose and pulp shown below.
Quote:
3 Biocellulose sound characteristics
Since the structure of the biocellulose sheet is different from pulp/paper, sound characteristics also different. The biggest different is how to construct or form to be a speaker's diaphragms. Normal paper cone have to went to several processes before it can be shaped. Biocellulose film however, can be form directly to the shape, without much effort and processes.
Physical characteristics comparison between processed biocellulose and other materials.
Quote:
As we can see here, biocellulose have a very high internal loss and Young's coefficient; like paper, but can transmit sound as fast as aluminium, which is near ideal sound characteristic for the speaker's diaphragm.
------
p/s
I wish I could paste pictures here, but the copyrights ......
