公开(公告)号：US3711688A

公开(公告)日：1973-01-16

申请号：US3711688D

申请日：1968-06-27

Applicant: BUNKER RAMO

Inventor： STOUT T ,  SMITH E ,  HIESTAND J

IPC: D21F1/06 ,  D21F1/00 ,  D21F11/04 ,  D21G9/00

CPC classification number: D21G9/0027 ,  D21G9/0054 ,  Y10S162/11

Abstract: Apparatus is disclosed for controlling the basis weight of double-layer paper from a Fourdrinier machine by: comprising composite dry basis weight from total basis weight and moisture measurements; computing the dry basis weight of the top layer from the composite dry basis weight and the stock flow and consistency data of both layers; correcting the stock flow rate for the top layer to achieve a desired top layer dry basis weight value; and correcting the stock flow for the bottom layer to achieve a desired composite dry basis weight taking into consideration the correction made in the stock flow of the top layer. Composite dry basis weight changes due to changes in machine speed and stock consistency are anticipated and corrected by making a compensating change in stock flow for both layers. The flow rate of fiber onto the wire screen of the machine is controlled by computing headbox total flow setpoints from fiber flow data and desired headbox consistency, and adjusting the headbox slice position accordingly. Speed of the slice jet relative to the wire screen is controlled by controlling headbox head.

Abstract translation: 公开了用于通过以下方式控制来自长网机的双层纸的基重的装置：包括从总基重和水分测量的复合干基重量; 从复合干基重和两层的库存流量和一致性数据计算顶层的干基重量; 校正顶层的库存流量以达到所需的顶层干基重量值; 并且考虑到在顶层的原料流中进行的校正，校正底层的原料流以达到期望的复合干基重。 通过对两层的库存流量进行补偿改变，可以预期和校正由于机器速度和库存一致性的变化而导致的复合干基重量变化。 通过从光纤流量数据和期望的流浆箱一致性计算流浆箱总流量设定点，并相应地调节流浆箱切片位置来控制光纤到机器的丝网上的流速。 通过控制流浆箱头来控制切片射流相对于丝网的速度。

公开(公告)号：US3711687A

公开(公告)日：1973-01-16

申请号：US3711687D

申请日：1968-06-27

Applicant: BUNKER RAMO

Inventor： HIESTAND J ,  STOUT T ,  SMITH E

IPC: D21F7/00 ,  D21G9/00 ,  G05D23/00 ,  D21F1/08

CPC classification number: D21G9/0018 ,  D21G9/0054 ,  Y10S162/10 ,  Y10S162/11

Abstract: Apparatus is disclosed for controlling freeness of stock from parallel refiners by controlling the rise in temperature of stock through each refiner. The Delta T setpoint for each refiner is adjusted to compensate for: variations in consistency of stock; maximum power rating of the refiner; weighted average freeness of stock from all refiners; and the composite frheness of stock delivered to a paper machine. Error in the desired temperature rise of a given refiner is employed to control its disc or plug operation. An on-line analyzer is employed to monitor composite freeness. Couch or flatbox vacuum is employed as an alternative measure of composite freeness, but only if intentional paper machine changes which would affect vacuum have not been made. Operator control of composite freeness is also permitted. The composite freeness setpoint is adjusted to maintain a desired paper bursting strength. Power checks are made and instructions are automatically given to adjust flow rate to an individual refiner in order to keep it operating within its maximum power limit and to add or delete refiners for optimum efficiency.

Abstract translation: 公开了通过控制通过每个精炼机的库存温度升高来控制来自平行精炼机的库存的游离度的装置。 调整每个精磨机的DELTA T设定值以补偿：库存一致性的变化; 精磨机的最大额定功率; 来自所有炼油厂的加权平均游离度; 以及交付给造纸机的原料的复合油墨。 使用给定精炼机的所需温度上升的误差来控制其盘或塞操作。 采用在线分析仪来监测复合游离度。 采用沙发或平箱真空作为复合打浆度的替代措施，但只有在没有造成影响真空的故意造纸机变化的情况下。 也允许操作员控制复合打浆度。 调节复合游离度设定点以保持所需的纸张破裂强度。 进行功率检查，并自动给出指令以调整单个精磨机的流量，以保持其在最大功率极限内运行，并添加或删除精炼机以获得最佳效率。