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公开(公告)号：DE69021042D1
公开(公告)日：1995-08-24
申请号：DE69021042
申请日：1990-11-01
Applicant: FIBERWEB NORTH AMERICA INC
Inventor： ZELDIN LEON , LAMKIN RONALD , WERNER JOSEPH
Abstract: A method and apparatus for providing uniformly distributed filaments from a spun filament bundle and a process for forming spunbonded fabric having superior uniformity and a favorable ratio between machine and cross direction tensile strengths. The apparatus includes a fiber transfer tube and a pair of adjustable deflector plates. The deflector plates form a channel having a tapering width for transporting the filaments in a stream of high velocity air. The apparatus may also include an electrostatic charging means for applying an electrostatic charge to each individual filament after it exits the channel. The method for providing uniformly distributed filaments includes a first stage of separating the filament bundle by the high velocity stream of air and may also include a second stage of electrostatically charging the filaments to achieve a uniform filament separation. The process for forming spunbonded fabric enables a fabric to be produced having a machine direction to cross direction tensile strength ratio less than about 1.5.
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公开(公告)号：DE69021042T2
公开(公告)日：1995-11-30
申请号：DE69021042
申请日：1990-11-01
Applicant: FIBERWEB NORTH AMERICA INC
Inventor： ZELDIN LEON , LAMKIN RONALD , WERNER JOSEPH
Abstract: A method and apparatus for providing uniformly distributed filaments from a spun filament bundle and a process for forming spunbonded fabric having superior uniformity and a favorable ratio between machine and cross direction tensile strengths. The apparatus includes a fiber transfer tube and a pair of adjustable deflector plates. The deflector plates form a channel having a tapering width for transporting the filaments in a stream of high velocity air. The apparatus may also include an electrostatic charging means for applying an electrostatic charge to each individual filament after it exits the channel. The method for providing uniformly distributed filaments includes a first stage of separating the filament bundle by the high velocity stream of air and may also include a second stage of electrostatically charging the filaments to achieve a uniform filament separation. The process for forming spunbonded fabric enables a fabric to be produced having a machine direction to cross direction tensile strength ratio less than about 1.5.
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公开(公告)号：DE69303711T2
公开(公告)日：1997-02-20
申请号：DE69303711
申请日：1993-03-29
Applicant: FIBERWEB NORTH AMERICA INC
Inventor： TRIMBLE LLOYD , ZELDIN LEON , GRUBBS WILLIAM , FRANCIS JOHN
Abstract: A slot draw attenuator apparatus and method are provided for producing webs of spunbonded thermoplastic filaments having improved cover even at low basis weights. The filaments are introduced to a slot draw attenuator having corona electrodes mounted in an elongate insulator bar and staggered and spaced along one wall of the attenuator slot near the exit end thereof. The corona electrodes are electrically connected to a high voltage source. The opposing wall of the slot is grounded. A corona is created in the attenuator slot so that the filaments are charged as they exit the attenuator. The electrostatic charge induces repelling forces in the filaments so that the filaments spread before they are randomly deposited upon a forming belt.
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公开(公告)号：DE69303711D1
公开(公告)日：1996-08-22
申请号：DE69303711
申请日：1993-03-29
Applicant: FIBERWEB NORTH AMERICA INC
Inventor： TRIMBLE LLOYD , ZELDIN LEON , GRUBBS WILLIAM , FRANCIS JOHN
Abstract: A slot draw attenuator apparatus and method are provided for producing webs of spunbonded thermoplastic filaments having improved cover even at low basis weights. The filaments are introduced to a slot draw attenuator having corona electrodes mounted in an elongate insulator bar and staggered and spaced along one wall of the attenuator slot near the exit end thereof. The corona electrodes are electrically connected to a high voltage source. The opposing wall of the slot is grounded. A corona is created in the attenuator slot so that the filaments are charged as they exit the attenuator. The electrostatic charge induces repelling forces in the filaments so that the filaments spread before they are randomly deposited upon a forming belt.
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