公开(公告)号：WO1993024693A1

公开(公告)日：1993-12-09

申请号：PCT/US1993004982

申请日：1993-05-26

Applicant: FIBERWEB NORTH AMERICA, INC.

Inventor： FIBERWEB NORTH AMERICA, INC. ,  ZELDIN, Leon, M. ,  FRANCIS, John, V. ,  VUILLET, Jean, Pierre

IPC: D04H03/16

CPC classification number: D04H3/16

Abstract: An apparatus is disclosed for forming a nonwoven fabric web, such as a spunbond web. The apparatus comprises a spinneret for downwardly extruding a curtain of filaments, and an underlying air drawing unit for drawing and attenuating the filaments as they move downwardly therethrough. A conveyor belt receives the drawn filaments and forms the filaments into a nonwoven fabric web. In the drawing unit, the filaments pass downwardly through a slot, and a pair of air nozzles are positioned in the slot, with one nozzle being positioned adjacent each sidewall of the slot. The nozzle outlets are oriented so as to introduce each of the air streams into the slot in a direction which is parallel to the sidewalls of the slot, and the introduced air streams act to draw additional air into the open upper end of the slot. The drawn-in air and the air introduced by the two nozzles collectively form a substantially non-turbulent flow at their juncture and along the remainder of the vertical length of the slot, and this smooth air flow serves to draw the filaments without imparting turbulence to the filaments, which in turn produces filaments which are uniformly drawn and thus of uniform denier.

公开(公告)号：WO1993021370A1

公开(公告)日：1993-10-28

申请号：PCT/US1993002917

申请日：1993-03-29

Applicant: FIBERWEB NORTH AMERICA, INC.

Inventor： FIBERWEB NORTH AMERICA, INC. ,  TRIMBLE, Lloyd, E. ,  ZELDIN, Leon, M. ,  GRUBBS, William, J. ,  FRANCIS, John, V.

IPC: D04H03/16

CPC classification number: D04H3/16

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.

Abstract translation: 提供了槽拉伸衰减器装置和方法，用于生产具有改进的覆盖层的纺粘热塑性长丝的网状物，甚至在低的基重下也是如此。 将长丝引入到具有安装在细长绝缘体棒中的电晕电极的狭缝拉伸衰减器，并且在其出口端附近沿衰减器狭槽的一个壁交错并间隔开。 电晕电极电连接到高电压源。 槽的相对壁接地。 在衰减器槽中产生电晕，使得灯丝在它们离开衰减器时被充电。 静电电荷引起丝中的排斥力，使得细丝在其随机沉积在成形带之前扩展。

公开(公告)号：EP0635077B1

公开(公告)日：1996-07-17

申请号：EP93911563.0

申请日：1993-03-29

Applicant: FIBERWEB NORTH AMERICA, INC.

Inventor： TRIMBLE, Lloyd, E. ,  ZELDIN, Leon, M. ,  GRUBBS, William, J. ,  FRANCIS, John, V.

IPC: D04H3/16

CPC classification number: D04H3/16

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.

公开(公告)号：EP0635077A1

公开(公告)日：1995-01-25

申请号：EP93911563.0

申请日：1993-03-29

Applicant: FIBERWEB NORTH AMERICA, INC.

Inventor： TRIMBLE, Lloyd, E. ,  ZELDIN, Leon, M. ,  GRUBBS, William, J. ,  FRANCIS, John, V.

IPC: D04H3

CPC classification number: D04H3/16

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.