Open capillary channel structures, improved process for making c

Details Open capillary channel structures, improved process for making c Open capillary channel structures, improved process for making c

1991-10-08

1993-04-06

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428167, 428 83, 428119, 428220, 428358, 428398, 428397, 428376, 428224, 428401, D01D 500, B32B 330

Patent

active

052002489

ABSTRACT:
Capillary channel structures having one or more intrastructure capillary channels, said structures comprising a polymer composition, wherein: said structures have a capillary channel base, and at least two polymeric capillary channel walls extending from said base along the length of said base in the axial direction for at least about 0.2 cm, said walls having a base end and a distal end, wherein said base and walls form said capillary channels; and said structures have a Specific Capillary Volume of at least about 1.2 cc/g, a Specific Capillary Surface Area of at least about 500 cm.sup.2 /g, and a Compressive Strength (Dry) of at least about 13,800 dynes/cm.sup.2. The structures can be in the form of fibers or sheets. The fibers have a Specific Capillary Volume of at least about 2.0 cc/g and a Specific Capillary Surface Area of at least about 2000 cm.sup.2 /g. An improved process, and extrusion dies for use therein, wherein the extrusion die has an annular orifice with wall orifices extending radially therefrom, are also provided.

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