| 摘要 |
In making articles of type having fibers fused together at points of contiguity thereof, a selection is made of a constituent, for application to the fibers, which has microwave absorptivity in excess of that of the fiber material and in which the fiber material is essentially insoluble. In making self-supporting porous elements, such as cigarette filters, filamentary tow defining the fibers is spread and selectively uncrimped and the selected constituent is applied thereto. The tow is then cylindrically shaped and conducted through a passage in microwave applicator apparatus of type tunable to optimize heating selectivity of the applied constituent whereby such point of contiguity fusion of the fibers is accommodated. Tow issuing from the microwave applicator is subjected to pressurized air and to recovery of vaporized applied constituent. <IMAGE> |
