Voice coil material -Paper bobbin

Kraft paper is a kind of tough paper. In the early days, the voice coil of loudspeakers used kraft paper as a framework. It can be formed by using a rectangular paper or spiral paper coil into a cylindrical shape, and the outer surface is coated with lock high-temperature resistant insulating adhesive. This paper framework is suitable for small caliber, low-power loudspeakers.Kraft paper voice coil framework has the following advantages:(1) Low cost.(2) Flat and free of burrs.Low cost: In the production of small caliber speakers, the volume is large, and the cost of components has a significant impact on the profits of speaker manufacturers. Paper voice coils have the advantage of low cost, which can help you reduce the cost of small caliber speakers.Flat, non burring: Skeleton burring is a common defect of paper voice coils, which affects the movement of the voice coil in the magnetic gap, causing abnormal sound from the speaker, and increasing scrap.