Systems and methods for making fiber webs
AssigneeHollingsworth & Vose Company
InventorDavid Vallery
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Abstract
Systems and methods for forming fiber webs, including those suitable for use as filter media and battery separators, are provided. In some embodiments, the systems and methods involve a first system for forming a fiber web (e.g., a wet laid system or non-wet laid system) and additionally one or more coating units. The first system for forming a fiber web may be used to form one or more fibrous layers of the fiber web, and the coating unit may be used to form an additional fibrous layer of the fiber web. In some embodiments, the systems and methods can be used to form fiber webs having a gradient in a property across a portion of, or the entire, thickness of the fiber web.
Claims51
A method of forming a fiber web, comprising:
- forming a first fibrous layer using a fiber web-forming system;
- and
- forming a second fibrous layer on the first fibrous layer using a coating unit,
- wherein the step of forming the second fibrous layer comprises depositing a coating layer on the first fibrous layer, and removing a solvent from the coating layer to form the second fibrous layer.
A method of forming a fiber web, comprising:
- forming a first fibrous layer using a fiber web-forming system, wherein the fiber web-forming system is a wet laid system;
- and
- forming a second fibrous layer on the first fibrous layer using a coating unit.
A method of forming a fiber web, comprising:
- forming a first fibrous layer using a fiber web-forming system;
- forming a second fibrous layer on the first fibrous layer using a coating unit;
- and
- removing a solvent from the first fibrous layer and/or the second fibrous layer using a dewatering system positioned downstream of the coating unit.
Dependencies are inferred from the claim text.