Abstract:
A method and apparatus for providing uniformly distributed filaments from a spun filament bundle and a process for forming spunbonded fabric having superior uniformity and a favorable ratio between machine and cross direction tensile strengths. The apparatus includes a fiber transfer tube and a pair of adjustable deflector plates. The deflector plates form a channel having a tapering width for transporting the filaments in a stream of high velocity air. The apparatus may also include an electrostatic charging means for applying an electrostatic charge to each individual filament after it exits the channel. The method for providing uniformly distributed filaments includes a first stage of separating the filament bundle by the high velocity stream of air and may also include a second stage of electrostatically charging the filaments to achieve a uniform filament separation. The process for forming spunbonded fabric enables a fabric to be produced having a machine direction to cross direction tensile strength ratio less than about 1.5.
Abstract:
The present invention provides composite nonwoven fabric laminates and processes for producing such. The fabric is comprised of a web of thermoplastic filaments laminated to at least one other web. Preferably, the filaments are spunbonded continuous polyolefin filaments which have an oxidatively degraded outer sheath portion to promote better interfilamentary bonding and improved fabric laminate strength. In a preferred embodiment, two outer nonwoven webs comprise oxidatively degraded spunbonded filaments and are positioned around and laminated to a web of meltblown microfibers thus forming an spunbond/meltblown/spunbond fabric. Additionally, a stretch compatible fabric may be formed in which a web of oxidatively degraded filaments is laminated to an elastic web. The fabrics of the invention may be advantageously used in numerous applications such as medical garments and disposable adsorbent products.
Abstract:
Un sistema sujetador mecánico resujetable que tiene elasticidad y estirabilidad integradas. El sistema sujetador incluye un primer miembro provisto con elementos acopladores y un segundo miembro que consiste de una oreja elástica estirable que tiene porciones extremas opuestas. Una porcion extrema de la oreja elástica es asegurada a uno de los objetos a ser sujetados. La porcion extrema en forma libre de la oreja elástica se extiende desde el objeto. El primer miembro del sistema de fijacion, el cual consiste de elementos acopladores, es asegurado al segundo objeto a ser asegurado. Los dos objetos son sujetados entre sí extendiendo la oreja elástica para que se acople a los elementos acopladores del primer miembro. La oreja elástica estirable provee libertad para el ajuste de la relacion espacial entre los dos objetos asegurados. Una aplicacion de esta invencion es el proveer un sistema de cerrado flexible para un pañal desechable.
Abstract:
PCT No. PCT/US93/00566 Sec. 371 Date Sep. 17, 1993 Sec. 102(e) Date Sep. 17, 1993 PCT Filed Jan. 22, 1993.The invention provides elastic fabrics which are substantially non-extensible in the machine direction and have substantial elastic properties in the cross-machine direction. The process stable fabrics of the invention include a net and a fibrous layer which are secured together. The net is composed of a plurality of continuous machine direction strands and a plurality of cross-direction strands. The machine direction strands are substantially non-extensible and the cross-direction strands are substantially elastic. The fabrics of the invention can be manufactured and processed more readily than fabrics which are elastic in both the machine direction and the cross-machine direction.