Nonwoven web with projections
First Claim
1. Nonwoven fabric comprised of overlapping thermoplastic fibers or filaments defining an array of hollow projections extending out of said fabric and separated by planar land areas in a plane taken along a line parallel to said fabric ignoring the projections and said fabric characterized by at least a 5 degree higher average degree of fiber or filament alignment in the projections than in the land areas.
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Accused Products
Abstract
Nonwoven web and method of making including interbonded thermoplastic fibers in an array of hollow projections extending outwardly from at least one surface of said web. The projections are separated by land areas of interbonded fibers, and the fiber orientation is greater in the projections than in the land areas. Either the projections or the land areas may be perforated as desired for controlled porosity and fluid flow properties. The nonwoven webs of the invention may be made by a number of processes but, preferably, are made by forming directly on a surface with corresponding projections with or without apertures and a vacuum assist or by forming on an apertured surface with a pressure differential sufficient to draw the fibers through the apertures forming the projections. The disclosure includes such webs with added fiber layers and as components of a wide variety of products including personal care items such as liners for sanitary napkins, household products such as cleaning materials and wipers, in the service product area such as towels, washcloths and bathmats, in the marine and automotive area as scrubbing and protective applicators, and in the hospital and veterinary areas as wipes and dispensing cloths. The method and apparatus disclosed may be varied as to steps and configuration to impart desired web constructions and properties, and preferred embodiments are disclosed.
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Citations
71 Claims
- 1. Nonwoven fabric comprised of overlapping thermoplastic fibers or filaments defining an array of hollow projections extending out of said fabric and separated by planar land areas in a plane taken along a line parallel to said fabric ignoring the projections and said fabric characterized by at least a 5 degree higher average degree of fiber or filament alignment in the projections than in the land areas.
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64. Method of forming a nonwoven web comprising the steps of,
(a) depositing thermoplastic fibers or filaments as a web onto a foraminous shaped surface, (b) applying a pressure differential to said fibers or filaments while on said surface, to form an array of projections and land areas corresponding to said shaped surface, (c) increasing the alignment of said fibers or filaments in the projection areas by at least 5 degrees, and (d) separating said web from said surface.
Specification