Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1993-05-14
1995-03-14
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428286, 428290, 428287, 428296, 428219, 428213, 428220, 428302, 428181, 428102, 428300, 553853, 55521, B32B 702, B32B 2734, B32B 506
Patent
active
053976320
ABSTRACT:
An improved nonwoven multi-layered composite article is provided that is well amenable to pleating and service as a depth gaseous filtration medium. The components utilized to form the multi-layered composite consist essentially of polyester continuous filaments and staple fibers (as described in detail hereafter) and are mechanically secured together by needle-punching. At least one surface is lightly resin coated following the needle-punching in order to impart additional stiffness to the overall nonwoven laminated composite. The resulting article is capable of readily undergoing pleating to form a pleated filtration medium. In a preferred embodiment the resulting composite is free of any component that is capable of substantial moisture retention thereby enhancing the stability and shape retention properties of the product over a broader range of operating conditions. Additionally, in a preferred embodiment an outer surface of the composite article has been subjected to a heat relaxation treatment prior to resin coating in order to reduce the size of needle holes and to enhance the particle arrestance and dust holding capacity of resulting article.
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Murphy, Jr. William F.
Powell Randy E.
Lesmes George F.
Reemay Inc.
Shelborne Kathryne E.
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