Airlaid Latex Binder Make-Up & Drying Load

Add-on is quoted on unbonded web weight here, which is the convention in airlaid; a specification written on FINISHED weight means something different by the same percentage and the two diverge quickly at high loadings - at 22 percent on web the binder is only 18 percent of the bonded sheet. Check which basis a customer specification is using before matching a number to it. Application efficiency covers overspray, misting and binder that penetrates through and is lost to the wire, and it is a machine-and-recipe property rather than a constant: it falls as viscosity drops, as line speed rises and as the web gets more open, so a figure measured on one grade does not transfer to a lighter one. The water figure is what the drying section actually has to remove and is usually the real capacity limit on an airlaid line - a grade change that raises add-on by five points raises the drying load far more than it raises the binder bill, and a line that runs out of oven before it runs out of anything else has this calculation to thank. Nothing here predicts bonded strength, which depends on binder glass transition, cure and fibre-to-fibre bond geometry rather than on quantity alone.