公开(公告)号：US5022166A

公开(公告)日：1991-06-11

申请号：US534798

申请日：1990-06-07

Applicant: Dong D. Nguyen ,  Marvin L. Harris

Inventor： Dong D. Nguyen ,  Marvin L. Harris

IPC: D21F7/04 ,  B65H23/24 ,  F26B13/00

CPC classification number: B65H23/24 ,  F26B13/007

Abstract: Apparatus and methods for reducing the amplitude and frequency of web-edge flutter associated with drawing web materials are provided. The apparatus includes a pair of air foils disposed proximate to a pair of opposing planar surfaces of the web. Each of the air foils includes a first convex surface facing the web and disposed in contact with air flowing on the web for producing a venturi effect which reduces at least the flutter amplitude in the open draw.

公开(公告)号：US4968386A

公开(公告)日：1990-11-06

申请号：US192255

申请日：1988-05-10

Applicant: Dong D. Nguyen

Inventor： Dong D. Nguyen

IPC: D21F5/04 ,  D21G9/00

CPC classification number: D21G9/0009 ,  D21F5/04

Abstract: An apparatus and method for determining the frequency and amplitude of flutter of a moving web in a web manufacturing operation, is shown to include a sensor for sensing the pressure of air in a region proximate the web and for generating a pressure signal reflective of the air pressure and a signal processor, connected to receive the pressure signal, for determining the amplitudes and frequencies of the flutter from the pressure signal and for generating an indication signal representative of the flutter amplitude and frequency.

Abstract translation: 用于确定幅材制造操作中的移动幅材的颤动的频率和幅度的装置和方法被示出为包括用于感测靠近幅材的区域中的空气压力并用于产生反映空气的压力信号的传感器 压力和信号处理器，连接以接收压力信号，用于从压力信号确定颤振的幅度和频率，并用于产生表示颤振幅度和频率的指示信号。

公开(公告)号：US5073714A

公开(公告)日：1991-12-17

申请号：US527216

申请日：1990-05-22

Applicant: Dong D. Nguyen

Inventor： Dong D. Nguyen

IPC: D21G9/00 ,  G01S17/87 ,  G01S17/88

CPC classification number: G01S17/875 ,  D21G9/0009 ,  G01S17/88

Abstract: Web flutter in a papermaking machine is monitored by a device which illuminates a portion of the web with infrared light and uses an infrared sensor to monitor the resulting infrared light scattered back from the web. Preferably two infrared light transmitters are used which are angled from each other to insure that light is scattered to the sensor independently of the orientation of the web.

Abstract translation: 在造纸机中的网络颤动由用红外光照射网的一部分的设备来监测，并且使用红外传感器来监测从卷筒纸返回的所产生的红外光。 优选地，使用彼此成角度的两个红外光发射器，以确保光独立于幅材的取向散射到传感器。

公开(公告)号：US4992142A

公开(公告)日：1991-02-12

申请号：US503186

申请日：1990-04-02

Applicant: Dong D. Nguyen

Inventor： Dong D. Nguyen

IPC: D21F5/04 ,  D21G9/00

CPC classification number: D21F5/04 ,  D21G9/0009

Abstract: An apparatus and method for determining the frequency and amplitude of flutter of a moving web in a web manufacturing operation, is shown to include a sensor for sensing the pressure of air in a region proximate the web and for generating a pressure signal reflective of the air pressure and a signal processor, connected to receive the pressure signal, for determining the amplitudes and frequencies of the flutter from the pressure signal and for generating an indication signal representative of the flutter amplitude and frequency.

Abstract translation: 用于确定幅材制造操作中的移动幅材的颤动的频率和幅度的装置和方法被示出为包括用于感测靠近幅材的区域中的空气压力并用于产生反映空气的压力信号的传感器 压力和信号处理器，连接以接收压力信号，用于从压力信号确定颤振的幅度和频率，并用于产生表示颤振幅度和频率的指示信号。