Centrifugal Drawing

Fibres used in glass wool and mats have to be chopped. Also, the surface treatment will control the performance in use. The process again starts with the glass delivery from a furnace. In 1955, Johns-Manville Company developed a process for low viscosity melt. Glass flow is dropped onto rotating cylinders spinning at an elevated velocity around their horizontal axis. Glass drops are projected from one cylinder to another before producing fibres of different lengths and reaching a moving belt downwards where remaining glass drops are aspired. Meanwhile the fibres are sprayed with organic binders with curing happening in the polymerization furnace downstream.