Water entanglement process and product
Patent 5009747 Issued on April 23, 1991. Estimated Expiration Date: 
June 30, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 30, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1989435 3485706 3493462 3620903 InventorsAssigneeApplicationNo. 374482 filed on 06/30/1989US Classes:162/115, By fluid pressure162/135, With coating after drying162/146, Synthetic (including chemically modified cellulose)162/208Treatment of slurry on mold surfaceExaminersPrimary: Chin, PeterAttorney, Agent or FirmForeign Patent References
International ClassD21H 027/02AbstractA method for hydroentangling nonwoven fibrous sheet material to significantly increase the strength thereof at low latex add-on values employs small diameter jets of high-pressure water in the form of coherent streams that concentrate the hydraulic energy over a distance equal to approximately the diameter of the fibers being entangled. While fiber entangling water jets have been utilized heretofore, the present invention employs a relatively lower pressure for the fiber rearrangement along with a synergistic effect of wood pulp and long polyester fibers coupled with small amounts of latex to achieve the unexpectedly high strengths within these light weight materials. The resultant sheet material possesses excellent uniformity of fiber distribution and improved strength characteristics over those typically obtained from prior art water jet enganglement processes requiring 300-2000% the enganglement input energy employed in this process. | |
