VERFAHREN UND APPARAT ZUR AUSWÄHLENDEN PLAZIERUNG VON FASERIGEM MATERIAL IN GEFORMTEN FASERIGEN ARTIKELN

Apparatus and methods for forming improved airlaid fibrous articles are disclosed. Airlaying apparatus is provided which permits at least two types of fibrous materials (11,31) to be defiberized and transported to a single airlaying apparatus. In a most preferred embodiment, a drum-type airlaying dr...

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Bibliographische Detailangaben
Hauptverfasser:	BERGQUIST, ROGER, SCHROEDER, MANFRED, WEIR, THEODORE, MONETTI, MATTHEW, FUNG, PAUL, WISLINSKI, MARTIN
Format:	Patent
Sprache:	ger
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS BRAIDING COTTON-WOOL DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE KNITTING LACE-MAKING MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN AMANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSESB31B OR B31C MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL MEDICAL OR VETERINARY SCIENCE NATURAL OR ARTIFICIAL THREADS OR FIBRES NON-WOVEN FABRICS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PERFORMING OPERATIONS PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING PROSTHESES SPINNING TEXTILES TRANSPORTING TREATMENT OR PROTECTION OF EYES OR EARS TRIMMINGS WADDING WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER
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Beschreibung
Zusammenfassung:	Apparatus and methods for forming improved airlaid fibrous articles are disclosed. Airlaying apparatus is provided which permits at least two types of fibrous materials (11,31) to be defiberized and transported to a single airlaying apparatus. In a most preferred embodiment, a drum-type airlaying drum (21) having a plurality of deposition cavities (17) is provided. By controlling the airflow and pressure differential, selective placement of each type of fibrous material (11,31) within a cavity (17) is achieved. Also disclosed are improved deposition cavities (17) which permit multiple materials to be airlaid and retained in position by providing a foraminous surface on at least a portion of the cavity sidewall. Most preferably, a hydrophobic fiber layer is formed and a layer of absorbent fiber is deposited within the first layer; the present invention permits a clear demarcation between the fiber types. Also disclosed is improved apparatus for removing airlaid articles from deposition cavities (17), using a precisely controlled airstream. Improved methods of making airlaid articles by regulating process parameters and using the improved apparatus of the present invention are also disclosed.