We produce combination fabrics to achieve special affects which we need in combination from two different styles of fabric. For example, we produce combination monofilament and multifilament fabrics because we want the efficiency of the multifilament fabric, but we want the release and slick surface characteristic of a monofilament fabric. We see many times in dry filtration fabrics where we have multifilament warps and spun fills. The purpose here again, is to enjoy the efficiency contributed by the spun fill yarn, yet the release qualities of the multifilament fabric.
In liquid filtration, we generally find that our fabrics will be woven with a satin weave or possibly a 2 by I twill weave, or at least, a weave that predominately puts the warp yarns on one side of the fabric and the fill yarns on the other side. As I stated above, the warp yarns define the release characteristics of the fabric, and the fill yarns define the efficiency.
Again, finishing these fabrics may incorporate calendering, scouring, heat setting, depending on the requirements of the end use. The performance of the combination fabric probably falls within the monofilament and multifilament with regard to cake release, efficiency, tendency to blind, flow rates, etc.