fiberfill fibers are mainly prosuced from PET flakes and are available as 2D and 3D crimped fibers.Typical fiber fineness of 6 or 15 denier is sufficient for most application.New nonwoven types require 3D fibers with even lower fineness.An improved spinning process with an asymmetric capillary geometry opens new prospects to produce hollow-conjugate fibers with improved hollowness and bulkiness.There is also a potential to produce fibers at lower fiber finess.With this technology the cross section of the fibers has a D shape and is therefore easily recognized.Capacities of 240 kg/h per spinneret have been successfully reached.
A challenge is the uniformity of the silicone coating through the complete fiber bundle,especially for capacities higher than 60 tons per day.Here,