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US 6,183,847 B2Granted
Coating selective zones of thin webs to change the pervious character thereof
AssigneeAvgol Nonwoven Industries
InventorMoshe Goldwasser
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AssigneeAvgol Nonwoven Industries
InventorMoshe Goldwasser
Estimating the term…
The process and apparatus of the present invention involves treating a well-integrated woven or non-woven web of hydrophobic fibers to make selected areas hydrophilic. It also can be used to make a web of hydrophilic fibers selectively hydrophobic. It uses a plurality of selectively adjustable covers on an applicator roll rotating in a bath of liquid to place the liquid material on selected areas of the web as the web moves over the roll. In a preferred embodiment the web is non-woven and the fibers are hydrophobic in nature, e.g., dry-laid or melt-blown polypropylene or polyethylene fibers or spun-bonded hydrophobic filaments. A woven web made of cotton or other hydrophilic fibers may also be used if the end result is to create partially hydrophobic areas on a hydrophilic web. The areas of liquid are positioned on the web only where desired so as to eliminate the excessive cost of unwanted and unnecessary coating material. If the web is hydrophobic, the liquid makes that area hydrophilic. If the web is hydrophilic, the liquid makes that area hydrophobic. Enhanced liquid containment and transport is obtained when at least one discontinuous fine fiber layer is utilized in the web and the fine fiber layer has a melt-blown content greater than zero but less than 1.5 gsm.
A unitary web for use in a disposable article for absorbing and containing liquid, said web comprising selectively treated zones treated to render each zone either liquid pervious or liquid impervious, and said web further comprising one or more integrated component layers with at least one component layer having a melt-blown content greater than zero but less than 1.5 grams per square meter (gsm).
A unitary web for use in a disposable article for absorbing and containing liquid, said web comprising selectively treated zones treated to render each zone either liquid pervious or liquid impervious, and wherein said selectively treated zones include a liquid impervious center zone continuously bounded on at least a portion of each longitudinally extending edge by a liquid pervious zone;
A unitary web for use in a disposable article for absorbing and containing liquid, said web comprising selectively treated zones treated to render each zone either liquid pervious or liquid impervious, and wherein said selectively treated zones include an untreated liquid impervious center zone continuously bounded on at least a portion of each longitudinally extending edge by a liquid pervious zone;
A unitary web for use in a disposable article for absorbing and containing liquid, said web comprising selectively treated zones treated to render each zone either liquid pervious or liquid impervious, and wherein said selectively treated zones include an untreated center zone continuously bounded on at least a portion of each longitudinally extending edge by a zone having a hydrostatic pressure greater than that of said untreated center zone;
Dependencies are inferred from the claim text.