RU1831772C - Composition for diaphragm - Google Patents

Abstract

Usage: electroacoustics, in particular the manufacture of speaker cones. SUMMARY OF THE INVENTION: a composition for a speaker cone contains cellulose and welded sisal in the following ratio, wt.%: Cellulose 5-95: welded sisal 5-95.

Description

The invention relates to electroacoustics, in particular to compositions for loudspeaker diffusers, and may find application in the manufacture of diffusers of high-quality electrodynamic loudspeakers.

The technical result that can be obtained by carrying out the present invention is expressed in increasing the acoustic properties of the loudspeaker by increasing the elastic modulus and damping coefficient of the diffuser and decreasing its specific gravity.

In the composition for the loudspeaker diffuser, unbleached sulphate cellulose or white sulphite cellulose or a combination of unbleached sulphate cellulose and bleached sulphite cellulose can be used as cellulose, and as a welded sisal-welded sisal, which is sisal half-mass, obtained by alkaline cooking by technology of cooking hard bast fibers.

The loudspeaker composition for the diffuser may contain, wt.%: Cellulose 50; welded sisal 50.

The loudspeaker diffuser composition may also contain, wt.%: Cellulose 95; welded sisal 5.

The loudspeaker diffuser composition may further comprise, wt.%: Cellulose 5; cooked sizzle 95.

If the composition of the loudspeaker for the diffuser contains cellulose more than 95 wt.% Or the content of welded sisal less than 5 wt.%, The elastic modulus and damping coefficient of the diffuser are significantly reduced and its specific gravity is increased, which leads to an increase in the non-linear distortion coefficient of the loudspeaker with diffuser from this composition.

If the cellulose content of the loudspeaker diffuser is less than 5 wt.% Or the sisal weld is greater than 95 wt.%, The mechanical strength of the diffuser from this composition is significantly reduced.

For the manufacture of a speaker cone, an aqueous suspension of the composition is used, in which cellulose and welded sisal have a mass ratio equal to their mass ratio in the composition.

(L

WITH

with

 H

h

Yu

CA

In the manufacture of a composition for a speaker cone, the dry sheets of cellulose are torn into pieces, which are loaded into a defibrer, where the pulp preliminarily dissolves and swells in a large amount of water. After the dissolution is completed, the pulp is pumped to a roll, where the direct grinding process takes place, i.e. chopping and fibril qi fibers. Grinding is carried out until the degree of grinding is equal to 23 28 RSP. At the end of the grinding, the concentration of cellulose in the suspension is measured. From this, the mass of cellulose in a given amount of suspension is determined. Then, cooked sisal is added to the cellulose suspension and the resulting suspension is mixed. In this case, the welded sisal is added to

5

the amount determined by the mass of cellulose in the cellulose suspension and the predetermined ratio of the mass of cellulose and the welded siz in the composition. Before the manufacture of the speaker cone, the suspension of the composition is diluted with water to obtain a predetermined concentration, for example, to a concentration corresponding to 1 g of the composition per 1 liter of water,

SUMMARY OF THE INVENTION A loudspeaker diffuser composition comprising cellulose is distinguished by both. that welded sisal was introduced into it in the following ratio of components, May.%:

Cellulose 5 95

Welded sisal 5-95.