| 摘要 |
PURPOSE:To form a speaker horn with good mass-productivity while suppressing the flutter echo of a horn by using the kneaded material of a high-molecular material and scalelike graphite powder. CONSTITUTION:High-molecular material 3 employs a mixture of polyvinyl chloride, a copolymer of vinyl chloride, vinyl acetate, etc., and further their thermoplastic resin, polyethylene, etc., for internal loss improvement and a plasticizer and stabilizer are added at need. Scalelike graphite powder 4 has a grain size of about 0.1-100mum and in general, the smaller, the better. This high-molecular material 3 and graphite powder 4 are mixed together at proper wt%, and the plasticizer and stabilizer are added at need; and the kneaded material kneaded by being heated is rolled by a roller many times to obtain sheet material 2 having graphite powder 4 oriented. A required number of sheet materials 2 are stacked to the prescribed thickness of the speaker horn and hot-pressed in one body to obtain plate material 5, which is formed in the shape of horn 6. |
