CONJUNTO DE BARRAS SEPARADORAS PARA UM APARELHO COM MATRIZ PARA MOLDACAO POR INSUFLACAO DE UM MATERIAL EM FUSAO

摘要

Melt blown die apparatus are provided for producing a fibrous web from a polymer material. The apparatus include die means for providing a molten stream of the polymer material and primary gas means having primary gas discharge channel means 30 for providing a pressurized gas at an exit end of the die means. The primary gas discharge channel means further includes gas lip means 14 for directing a portion of the pressurized gas to the molten polymer stream. Spacer bar means 16, 18 are also provided for determining a fixed spacing between the exit end of the die means and the gas lip means. This fixed spacing is substantially preset during assembly of the apparatus for a given range of apparatus operating temperatures and flow rates of the pressurized gas. This invention has been demonstrated to provide increased slot widths and set backs for extremely high exit gas flows approaching Mach 0.8. The invention also substantially eliminates centering offsets and dimensional instability associated with adjustment screws previously used for determining the spacing between the exit ends of the gas discharge channels and the die.