JPS6285091A - Paper passing method in coating roll of papermaking machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[INDUSTRIAL APPLICATION FIELD 1] The present invention relates to an improvement in a paper passing method in a coating roll section of a paper machine such as a size press or an online coater. [Prior Art 1] Conventionally, a paper machine has been equipped with a paper passing carrier A7- which runs approximately parallel to the paper web traveling direction of the paper machine at the same speed as the paper web in order to pass the paper between the rolls rotating at high speed. - When the paper is passed through the paper machine, the narrow part at the end of the paper web (usually called the tail) is sandwiched between the paper carrier ropes, and the paper is passed to the final reel. It has become.

[Problems to be Solved by the Invention] As described above, in a paper machine, a carrier rope for paper passing is installed almost parallel to the traveling direction of the paper web, and most of this carrier rope for paper passing is on the circumferential side of the If roll. It is guided by a guide groove provided in the section and is constantly moved by the paper making I, running at a circumferential speed with the filter paper web. However, in order to ensure that the above-mentioned guide groove forms an outflow path for the coating liquid, a carrier N7-lobe for paper passing is applied to the coating roll part where coating liquids such as sizing agents and polishing agents are applied. A fixed position carrier wheel that forms a traveling path at a position away from the side of the roll is installed in the lf paper machine, and this fixed position carrier wheel is moved while the paper passing carrier rope comes into contact with it. So it's constantly rotating. However, the coating roll section of a paper machine is in an environment where there are paper dust and mist of coating liquid that scatters from the nip section of the coating roll (hereinafter referred to as contaminants). If the contaminants adhere to the roll-side flange of the fixed-position carrier wheel, the rotation of the fixed-position carrier wheel causes the contaminants to fly into the paper web side where the paper is being passed, contaminating the paper web and significantly reducing the product value. there were. In order to solve this problem, a cover is installed on the carrier wheel which is located close to the applicator roll of the paper machine and rotates in constant contact with the wire carrying carrier rope, and the flange of the carrier wheel is fixed in position. A method has also been proposed to prevent contaminants from adhering to the carrier wheel, but if a cover is installed on the roll side of the fixed position carrier wheel, this cover must be removed when paper is fed, which makes the structure of the paper machine difficult. This has undesirable drawbacks, such as complexity, troublesome maintenance and management, and high equipment costs. (Means for solving the problem) Therefore, as a result of intensive research in order to solve this problem, the present inventors have found that the paper web runs at the same speed as the paper web under a constant tension almost parallel to the traveling direction of the paper web of the paper machine. The fixed position carrier wheel, which is always in contact with the carrier rope for paper passing, is positioned away from the nip of the applicator roll of the paper machine to remove contaminants scattered from the nip of the applicator roll. The present invention was completed by focusing on the fact that it is sufficient to prevent the adhesive from adhering to the fixed position carrier wheel. That is, the present invention provides a wire carrying carrier rope that runs approximately parallel to the paper web advancing direction of the paper machine at a constant tension and at a circumferential speed with the paper web, so that during normal operation of the paper machine, the wire carrier rope runs on the extension line of the coating roll nip. A coating roll section of a paper machine, characterized in that the coating roll section of a paper machine is characterized in that the paper is passed by moving the running path so that the paper runs in a position that is close to the extension line of the nip section of the coating roll when the paper is passed. This provides a method for passing paper. Hereinafter, a method for passing paper through the application roll section of a paper machine according to the present invention will be described in detail. The drawing is a side view of a main part showing a state in which the paper passing method in the coating roll section of a paper machine according to the present invention is implemented in a size press of a paper machine. In the drawing, 1 is a coating roll called a size press roll in a size press of a paper machine, 2 is a carrier rope for wire running which runs approximately parallel to the paper web traveling direction of the paper machine at a circumferential speed with the paper web, and 3 4 is a fixed position carrier wheel that is always in contact with the paper passing carrier rope 2 during normal operation of the paper machine, and 4 is a fixed position carrier wheel that is in contact with the paper passing carrier rope 2 only when paper is passing through the paper machine, and is connected to the paper passing carrier rope 2. This is a moving wheel that separates from the fixed position carrier wheel 3 and moves it to the paper passing position. Various mechanisms such as an air cylinder can be used as a means for separating the moving wheel 4 from the fixed carrier wheel 3 during paper passing through the paper machine. Reference numeral 5 denotes an autostretcher installed to run the carrier rope 2 for paper passing with a constant tension. [Function] When the paper passing method in the applicator roll section of the paper machine according to the present invention is carried out using the decoration of this structure, the paper passing at the position shown by the solid line in the drawing during normal operation is carried out with a constant tension. The paper carrier rope 2 runs at a position away from the extension line of the nip portion of the coating roll 1, and when paper is being passed, the moving route of the paper passing carrier rope 2 is changed to the position shown by the broken line in the drawing by the moving wheel 4. The coating roll 1 is caused to run at a position similar to the extension line of the nip portion of the coating roll 1. If you try to change the traveling route of the wire carrying carrier rope 2 in this way and make it run away from the nip extension line of the applicator roll 1, the wire carrying carrier rope 2 may become slack or have a very large amount of slack. There is a possibility that tension may be applied, but the occurrence of such a phenomenon is due to autostretch l7-
5 is installed on the travel path of the paper passing carrier rope 2, and the paper passing carrier rope 2 is maintained at a constant tension, so there is no problem. Effects of the Invention The paper feeding method in the applicator roll section of the paper machine according to the present invention as described in detail above is such that the paper is passed at a circumferential speed with the paper web with a constant tension substantially parallel to the paper web traveling direction of the paper machine. The carrier rope is moved to a position away from the extension line of the coating roll nip during normal operation of the paper machine, and is moved by a moving wheel so that it runs at a position close to the extension line of the coating roll nip during paper feeding. The structure is extremely simple and easy to implement since the traveling path is simply moved, and the contaminants scattered from the nip of the coating roll of the paper machine do not adhere to the fixed carrier wheel. The rotation of the position-fixed carrier wheel prevents adhering contaminants from scattering from its flange and contaminating the paper web being passed through, and the industrial effect of the method of the present invention contributing to the paper manufacturing field is very large. There is something.

[Brief explanation of drawings]

The drawing is a side view of a main part showing a state in which the paper passing method in the coating roll section of a paper machine according to the present invention is implemented in a size press of a paper machine. In the drawing 1... Coating roll 2... Carrier rope for paper passing 3... Fixed position carrier A7-Wheel 4... Moving wheel

Claims (1)

[Claims] 1. A carrier rope for paper passing, which is made to run approximately parallel to the paper web traveling direction of the paper machine under constant tension and at the same speed as the paper web, is kept away from the extension line of the coating roll nip during normal operation of the paper machine. A method for passing paper in a coating roll part of a paper machine, characterized in that the paper is passed by moving the running path so that the paper travels at a position close to the extension line of the nip part of the coating roll when passing the paper. .