Carded nonwovens typically use a parallel-laying technique, ensuring they have a more uniform fiber alignment than other nonwoven materials. This creates a greater stability and internal bond strength in the machine direction, but creates the reverse qualities in the cross-machine direction.

Some applications require material strength to be greater in one direction, but many do not. For those cases, carding machines are equipped with randomizer rolls that allow the fibers to be reoriented to make the strength more even, although a 1:1 strength ratio is never obtained.

Since the uniformity (or non-uniformity) of material strength is frequently important for applications using carded wovens, web inspection systems are essential to monitor fiber alignment and directional strength. This ensures the material does not have undetected weaknesses that may impact upon performance.
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