초록 ▼

Multilayer meltblown fibrous webs, as well as apparatus and methods of forming the webs. The webs are produced on a rotating collector that also moves parallel to its longitudinal axis. The webs are thus formed in a helical process, and the resulting tubular web is separated in a direction parallel

Multilayer meltblown fibrous webs, as well as apparatus and methods of forming the webs. The webs are produced on a rotating collector that also moves parallel to its longitudinal axis. The webs are thus formed in a helical process, and the resulting tubular web is separated in a direction parallel to a helix angle. By separating the tubular web in a direction parallel to the helix angle, a flat multilayer meltblown fibrous web is provided that allows for incorporation of feathered edges formed during the article's manufacture.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for manufacturing a meltblown fibrous web, the apparatus comprising:(i) a collector comprising a generally cylindrical forming surface that can rotate about a longitudinal axis and that can simultaneously move parallel to the longitudinal axis such that a sel

[ What is claimed is:] [1.] An apparatus for manufacturing a meltblown fibrous web, the apparatus comprising:(i) a collector comprising a generally cylindrical forming surface that can rotate about a longitudinal axis and that can simultaneously move parallel to the longitudinal axis such that a selected point on the forming surface can move in a helical pattern about and along the longitudinal axis from a first end of the collector to a second end of the collector, the helical pattern defining a helix angle relative to the longitudinal axis;(ii) a source that is capable of directing meltblown fibers at the forming surface; and(iii) a separator that can separate a tubular meltblown fibrous web formed on the forming surface in a direction generally parallel to the helix angle to convert the tubular meltblown fibrous web into a non-tubular meltblown fibrous web.