CLOVERDALE, CA, November 24, 2015-

“Multi-layer composite for use in an air filter”; US 9,180,394 (Nov. 10, 2015); filed: Mar. 13, 2008. Assignee: Carl Freudenberg KG (Weinheim, Germany). Inventor(s): Heiko Manstein, Robert Groten, Anthony Hollingsworth, Ingrid Ewald, Joachim Hendler, Klaus Veeser.
The invention relates to a cost-effective multi-layer composite for use in an air filter. The composite consists of at least one upstream ply and a support ply that is connected to the upstream ply. The upstream ply is made of a nonwoven fabric and has a finer porosity than the support ply. The aim of the invention is to form and further develop a multi-layer composite for use in an air filter, in particular in a filter bag in such a manner that the upstream ply can be connected in a stable and economical manner to the support ply. The invention is characterized in that the upstream ply is embodied as a spun bonded nonwoven, the continuous filaments of which are at least partially twisted or interwoven with the support ply.

“Stitch bonded creped fabric construction”; US 9,187,851 (Nov. 17, 2015); filed: Jun. 14, 2012. Assignee: Tietex International Ltd. (Spartanburg, SC). Inventor(s): Martin Wildeman, Lori Shannon Sears.
A stitch-bonded fabric construction is provided with broadly spaced parallel linear stitch lines which are applied through a very low weight fibrous substrate to stabilize the substrate in the machine direction. Texture is imparted by applying significant overfeed conditions to the stitching substrate thereby causing a substantial bunching of the substrate at the stitching position. The resulting product has an arrangement of alternating ridges and valleys running predominantly in the cross-machine direction. The stabilizing linear stitch lines lock in the puckered texture. The structured fabric is useful in disposable wiping and diaper applications.

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