Construction Membrane. (Patient Review).Construction Membrane: No. 6,355, 333; James Waggoner, Mieczyclaw Stachnik, Theresa Weston and Michael Bryner, assignors to E. I. DuPont de Nemours and Company, Wilmington, DE. Filed 6/9/99. Issued 3/12/02. A construction membrane comprising a unitary, nonwoven non·wo·ven adj. Made by a process not involving weaving. Used of textiles. n. Material or a fabric made by a process not involving weaving. , spunbonded barrier sheet and material consisting essentially of synthetic plexifliamentary fibers, the sheet material has a basis weight of less than 600g/m2. The membrane also features a hydrostatic head Noun 1. hydrostatic head - the pressure at a given point in a liquid measured in terms of the vertical height of a column of the liquid needed to produce the same pressure of greater than 12cm, a Gurley Hill porosity of greater than 10 seconds, a moisture vapor transmission rate Moisture vapor transmission rate (MVTR), also water vapor transmission rate (WVTR), is a measure of the passage of water vapour through a substance. There are many industries where this property is critical. Here are some examples. , measured by the LYSSY method of 25g/m2/day. The barrier sheet material has a first side textured with protrusions In a random polyhedral polyhedral /poly·he·dral/ (-he´dril) having many sides or surfaces. polyhedral having many sides or surfaces. pattern. The protrusions' height Is in the range of 0.25-1.0mm, defining channels in multiple directions for providing paths by which a liquid, located against a first side, can drain. |
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