公开(公告)号：WO1991006004A1

公开(公告)日：1991-05-02

申请号：PCT/US1990005186

申请日：1990-09-13

Applicant: WEYERHAEUSER COMPANY

Inventor： WEYERHAEUSER COMPANY ,  HALLEY, David, G. ,  GESS, Jerome, M.

IPC: G01N33/46

CPC classification number: G01N33/343 ,  G01N1/2035 ,  G01N2001/1025 ,  G01N2001/185 ,  G01N2001/2826

Abstract: The invention is an apparatus and method for measuring drainage time of a papermaking stock suspension (62). The apparatus will automatically measure drainage times of a plurality of samples which will preferably be of differing basis weights. It consists of a sheet mold reservoir (10) and dropleg (26) which index against or away from a table (12) having spaced apart sheet forming locations (14). Operation of the apparatus is determined by a programmable controller which causes stock to be automatically transferred to the sheet mold and the reservoir and dropleg to be automatically and appropriately positioned. After a sheet is formed, the table automatically indexes to the next forming position where the cycle is repeated. The method involves plotting a series of at least three points to determined the slope of drainage time versus the basis weight of the sheets formed. This can be used as an indicator of the drainage characteristics of a stock of given basis weight on the forming section of a paper machine.

公开(公告)号：WO1993006481A1

公开(公告)日：1993-04-01

申请号：PCT/US1992008116

申请日：1992-09-24

Applicant: WEYERHAEUSER COMPANY

Inventor： WEYERHAEUSER COMPANY ,  GESS, Jerome, M. ,  PETERSEN, Dennis, E. ,  ADAMS, Terry, N. ,  MARTZ, Russell, J.

IPC: G01N33/34

CPC classification number: G01N33/34

Abstract: A drainage tester evaluates the reaction pattern of one or more reactions in a paper pulp furnish to predict behavior of the pulp on a paper line. The tester includes a mixing container in which an additive is mixed with the slurry under conditions that prolong the reactions in the container such that they take longer than the same reactions on a paper line. The mixer can also mimic the kinetic conditions (such as mixing by turbulence or passive diffusion) under which the additive is mixed with the furnish on the paper line. A test container has a screen bottom that separates furnish solid from slurry water by developing a pressure differential across the screen. An intermediate container is positioned between the mixing container and test container to provide a constant hydrostatic head on furnish transferred to the test container. A sensor above the screen in the test container monitors changes in the optical characteristics of a sheet formed on the screen to automatically determine the drainage time of the formed sheet. Sequential equal volume aliquots of furnish are withdrawn from the mixing container and sent to the test container at preselected time intervals after chemical additives are mixed with the furnish in the mixing container. Physical characteristics of the sheet, such as fines retention, drainage time and visual appearance, are recorded as a function of time from addition of additive to the mixing container. Behavior of the sheet on the paper line can be predicted in this manner to help an operator efficiently operate a paper machine system.

Abstract translation: 排水测试器评估纸浆配料中的一个或多个反应的反应模式，以预测纸浆线上纸浆的行为。 测试仪包括混合容器，其中在延长容器中的反应的条件下将添加剂与浆料混合，使得它们比纸线上的相同反应长。 混合器还可以模拟动态条件（例如通过湍流或被动扩散混合），在该条件下添加剂与纸上的配料混合。 测试容器具有屏幕底部，通过在屏幕上形成压力差，从而将固体与浆料水分离。 中间容器位于混合容器和测试容器之间，以在传送到测试容器的配料上提供恒定的静水压头。 测试容器中的屏幕上方的传感器监测在屏幕上形成的片材的光学特性的变化，以自动确定成形片材的排水时间。 将化学添加剂与混合容器中的配料混合后，将预定时间间隔从混合容器中取出等份的配料，并将其送至测试容器。 从添加剂添加到混合容器中，片材的物理特性，例如细粉保留量，排水时间和视觉外观被记录为时间的函数。 可以以这种方式预测纸张在纸张线上的行为，以帮助操作者有效地操作造纸机系统。

公开(公告)号：EP0495800A1

公开(公告)日：1992-07-29

申请号：EP90913962.0

申请日：1990-09-13

Applicant: WEYERHAEUSER COMPANY

Inventor： HALLEY, David, G. ,  GESS, Jerome, M.

IPC: G01N33 ,  G01N1

CPC classification number: G01N33/343 ,  G01N1/2035 ,  G01N2001/1025 ,  G01N2001/185 ,  G01N2001/2826

Abstract: L'invention concerne un appareil et un procédé pour mesurer le temps de drainage d'une suspension de pâte à papier (62). L'appareil mesure automatiquement les temps de drainage d'une pluralité d'échantillons qui sont, de préférence, de poids de base différents. Ledit appareil comprend un réservoir de moule de feuilles (10) et une colonne barométrique (26) qui se placent contre une table ou s'éloignent de celle-ci (12), ladite table étant dotée d'emplacements de formation de feuilles espacées (14). Un contrôleur programmable commande l'opération de l'appareil, en faisant transférer automatiquement de la pâte au moule de feuille, et en positionnant automatiquement et convenablement ledit réservoir et ladite colonne barométrique. Lorsqu'une feuille est réalisée, la table se déplace automatiquement vers la position de formation suivante où le cycle se répète. Le procédé comprend le traçage d'une série d'au moins trois points de manière à déterminer la pente du temps de drainage par rapport au poids de base des feuilles ainsi réalisées. On peut ainsi obtenir, sur la section de formation d'une machine à papier, un indicateur des caractéristiques de drainage de pâte à papier d'un poids de base donné.