Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Bulk deposition of particles by differential fluid pressure
Reexamination Certificate
1999-04-16
2002-04-23
Silbaugh, Jan H. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Bulk deposition of particles by differential fluid pressure
C264S517000, C264S128000, C264S129000, C264S282000, C264S283000, C156S183000, C162S111000, C162S112000, C028S104000, C028S105000, C028S106000, C028S169000
Reexamination Certificate
active
06375889
ABSTRACT:
BACKGROUND OF THE INVENTION
There is a need in the apparel industry to provide a fabric having recoverable stretch in the machine direction. The “machine direction,” as used herein, is the long direction of a roll of fabric corresponding to the direction in which the fabric is conveyed on a machine as it is being produced. Some of the end uses for these recoverable stretch fabrics include waistbands, undergarment components and interlinings. It is generally known to incorporate elastic components into woven and nonwoven fabrics, but such fabrics tend either to have an uneven surface or a heavy basis weight.
Nonwoven fabrics are produced by a variety of processes in which fibers or filaments are bonded together without involving traditional textile processes such as weaving. Many of such fabrics can be elongated in the machine direction, but the elongation has very limited recovery, and the recovery disadvantageously decreases after each successive elongation.
An object of the present invention is to provide a nonwoven fabric having a low basis weight, a uniform surface, and which is capable of substantial recovery back to near original length in the machine direction upon successive elongations. A further object of the invention is to provide a method for producing the fabric of the invention.
SUMMARY OF THE INVENTION
The present invention comprises a compacted non-woven fabric with a basis weight of about 1-5 oz/yd.
2
(“osy”) (about 31.2 gm/m
2
to 156.2 gm/m
2
), having a level of recovery of at least 40% after five cycles of 35% machine direction elongation. The level of recovery is preferably greater than 50% in the machine direction after five cycles of 35% elongation. The fabric of the invention further comprises a substantially uniform surface. As used herein, the term “substantially uniform surface” refers to a surface that appears ungathered, unbunched, and otherwise substantially flat to the eye or touch.
The present invention further comprises a method for producing the fabric of the invention, generally comprising the steps of providing a non-woven polymer web with basis weight of about 1-5 osy, microcreping the web in the machine direction to a compaction of at least 20%, heat setting the web during or shortly after creping, and cooling.
REFERENCES:
patent: 3255064 (1966-06-01), Makansi
patent: 3485706 (1969-12-01), Evans
patent: 3687754 (1972-08-01), Stumpf
patent: 3949128 (1976-04-01), Ostermeier
patent: 4421812 (1983-12-01), Plant
patent: 4717329 (1988-01-01), Packard et al.
patent: 4735842 (1988-04-01), Buyofsky et al.
patent: 4810556 (1989-03-01), Kobayashi et al.
patent: 4894196 (1990-01-01), Walton et al.
patent: 4919877 (1990-04-01), Parsons et al.
patent: 5240764 (1993-08-01), Haid et al.
patent: 5389202 (1995-02-01), Everhart et al.
patent: 5428876 (1995-07-01), Boulanger et al.
patent: 6068909 (2000-05-01), Koseki et al.
patent: 6080466 (2000-06-01), Yoshimura et al.
patent: 7243159 (1995-09-01), None
Holmes Rory
Yang Jerry
Poe Michael I.
Polymer Group Inc.
Pyle & Piontek
Silbaugh Jan H.
LandOfFree
Method of making machine direction stretchable nonwoven... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making machine direction stretchable nonwoven..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making machine direction stretchable nonwoven... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2864096