Inclined Wire and Fourdrinier Forming Sections
topic
Wetlaid forming sections use inclined wire formers or horizontal Fourdrinier wire tables to deposit fibre from dilute slurry onto moving permeable wire screens at production speeds of 20 to 200 metres per minute, with drainage foils, hydrofoils, and vacuum suction boxes beneath the wire removing water from the deposited web to form a coherent fibre mat before pressing and drying sections consolidate and dry the wetlaid web.
Role
Forms the fibre web from aqueous suspension through gravity and vacuum-assisted drainage that deposits fibres on the wire screen in the isotropic random orientation that gives wetlaid its characteristic excellent formation uniformity, with wire speed, headbox jet velocity, and drainage control determining the basis weight, formation quality, and machine-direction to cross-direction orientation balance of the wetlaid web.
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