公开(公告)号：US4517054A

公开(公告)日：1985-05-14

申请号：US430232

申请日：1982-09-29

Applicant: Jorma Hujala ,  Martti Koponen

Inventor： Jorma Hujala ,  Martti Koponen

IPC: D21F1/48 ,  D21F3/00 ,  D21F7/02 ,  D21F9/02

CPC classification number: D21F1/48 ,  D21F3/00

Abstract: An improvement in a web-forming section of a paper machine intended as a modernization of a fourdrinier-wire part by which an improved formation of the web and an adjustable dewatering thereof by which better retention and desired distribution of fillers and fines is achieved. The web-forming section constitutes an improvement in an arrangement which includes a fourdrinier wire loop having a wire run which constitutes a lower wire of the web-forming section and which forms a single-wire initial portion of a dewatering zone of the web-forming section, and an upper wire unit which together with a run of the lower wire forms a two-wire dewatering zone within which dewatering takes place through the upper wire, wherein a first open faced forming roll is situated within the upper wire loop so that the two-wire dewatering zone begins in the region of the first forming roll, a horizontal plane tangent to the lower part of the first forming roll being substantially coplanar with the plane of the lower wire, a forming shoe within the fourdrinier wire loop having a curved deck which guides the joint run of the upper and lower wires, a reversing roll situated within the upper wire loop after the forming shoe and which guides a joint run of the upper and lower wires over an upwardly curved sector thereof until the joint run substantially coincides with the plane of the lower fourdrinier wire. Initial dewatering occurs in the single-wire initial portion of the dewatering zone to an appropriate extent through the lower wire. In the two-wire dewatering zone, dewatering occurs first within the sector of the first open forming roll in two directions through both the upper and lower wires whereupon within the region of the forming shoe, the dewatering takes place primarily upwardly through the upper wire.

Abstract translation: 纸机的卷筒纸成型部分的改进，旨在作为长网丝部件的现代化，通过该方法改进了幅材的形成和可调节的脱水，从而实现了更好的保持性和所需的填料和细粉分布。 幅材形成部分构成了一种布置的改进，该布置包括具有构成网状物形成部分的下部丝线的丝线的长网线圈，并且形成幅材成形的脱水区域的单线初始部分 以及上部丝线单元，其与下部丝线的行程一起形成双线脱水区域，在该双线脱水区域内通过上部线材进行脱水，其中第一敞开的成形辊位于上部线环内，使得 双线脱水区从第一成形辊的区域开始，与第一成形辊的下部相切的水平面基本上与下部金属丝的平面共面;在长网线环内的成形靴具有弯曲的 引导上，下电线的联合行驶的甲板，位于成形靴后的上线环内的反转辊，并且引导上下电线的接合行程 其向上弯曲的扇形部分，直到接合行程基本上与下长丝网的平面重合。 初始脱水在脱水区的单线初始部分通过下部导线适当地发生。 在双线脱水区域中，脱水首先在第一开放成形辊的扇形区域中沿两个方向穿过上部和下部两个导线，因此在成形鞋的区域内，脱水主要通过上部线材向上发生。