| 摘要 |
The invention provides a method of making a porous material, wherein a web of open textured woven or knitted textile fabric (10) is unwound from a reel (12) and fed through an open topped vessel (14) which contains a cementitious mix (16). A roller (18) in the vessel ensures that the fabric (10) spends sufficient time in the mix to be thoroughly impregnated by the mix. The mix accordingly fills the openings in the weave or knit of the fabric (10). A slit like air nozzle (20) is located close to where the impregnated fabric emerges from the vessel (14). Air pressure, and the linear speed at which the fabric (10) is travelling, determines how much of the cementitious material in the openings is blown out and falls back into the vessel (14). To assist the air jet in removing mix from the openings, the fabric (10) can be vibrated. |
