JPS5994697A - Control of paper web edge part - 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 The present invention d relates to an improvement in the papermaking process, in particular to a method for separating the edges of a paper web formed on an advancing wire, the web being in one or more layers. .

In paper machines, sheets or webs are formed by depositing one or more layers of stock, the fibers of which are suspended in water, onto a advancing wire. The paper 1 is generally obtained from wood or other vegetable fibres, and the suspended stock is delivered onto the advancing wire by a headbox having a slicing opening and disposed along the wire. . The longitudinal edges of the double stock layer formed in this way are not completely uniform or constant from a geometrical and dimensional point of view.

These edges must therefore be uniform and consistent after the hethox or stock is deposited on the wire. This is often done by a water/etc method. These water jets are directed at the stock edges on the wire to separate the most uneven edges from the web. The paper waste generated in this separation device is collected and collected, and the recovered raw material is used as additional paper stock.

Conventional methods and apparatus for cutting and shaping the advancing web edges have been disadvantageous. First of all, these methods do not allow complete and effective recovery of the raw material waste coming out of the separated edges. This is because the edge-forming equipment is typically located a considerable distance downstream from the head hox where it cuts the edges of single or multi-layer webs in one go, and where multiple layers are used, each layer This is because they are generally composed of fibers of different types and qualities.

That is, when making multi-layer paper, one layer is made of fibers that have unique tear strength, and the second layer is made of fibers that have unique flexibility. If the edges of the multilayers are separated,
These edges cannot also be used to create a falling layer because the fibers are mixed. It is almost impossible to separate the fibers of the various layers after they have been mixed, and their subsequent utilization is highly controlled.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for adjusting and cutting the edges of one or more successive paper layers fed from a plurality of head boxes, the method and mechanism of which It allows the edges to be separated, while allowing the paper waste fibers separated from the web edges at any time to be completely reused.

Yet another object of the present invention is to provide a device for cutting the edges of the advancing paper web being formed, which device can be coupled with a headbox and which performs the separation at an early stage of paper ply formation. .

The arrangement of the present invention provides a method for adjusting the edges of one or more overlapping layers placed on a continuously advancing wire of a paper machine, such that each layer is positioned in its respective headbox. The blade or at least one of the layers is fed through the slicing opening therein and separates the edges of one of the blades or at least one of the layers from the remaining layers emerging from the slicing opening, causing edge separation to occur. Twelve platforms are provided to be transported to the paper waste collection device.

SUMMARY OF THE INVENTION The present invention provides a device for adjusting the width or edge of at least one layer of a fibrous web deposited onto the advancing wire of a paper machine so that the paper layer passes through a slice of the headbox and its position. The mechanism also features a blade cut into the head box and positioned to separate the edge of at least one layer from the remaining layers.
Conveying means are also provided for conveying the stock waste generated by the edge separation to the collection device.

Other objects, advantages, and features of the invention will become more apparent from the concepts and principles of the invention in connection with the preferred embodiments.

In a continuous paper web production system, a wire (Figures 1 and 0 and 2) with a series of multiple holes is provided in the web forming chamber and the fibers (generally is arranged to receive one or more layers of paper stock (wood fibers).

Each layer is delivered through the slicing opening 2 of its respective pedbox 3 into which the appropriate amount of stock is delivered through the slicing opening in a continuous stream of stock. Since the opening 2 is located on the wire 2, the stock exiting the slicing opening flows out at a defined flow rate and forms a layer of defined thickness on the wire, as can be seen in FIG.

The mechanism according to the invention comprises at least one plane blade 5 which extends in the longitudinal direction of the machine in a plane perpendicular to the plane of the wire and essentially perpendicular iα to the plane of the stock layer exiting the slicing opening. It is placed on a stretching surface. The blade has a sharp front cutting edge 6 which contacts the front edge 7 of the slicing opening (Fig. 3) and also contacts the upper and lower slicing lips (.
The blade is positioned so that the tip actually protrudes into the slicing opening.

When the stock layer exits the slicing opening 2, the blade is placed in a defined position relative to the width of the web so as to be able to separate the edge of at least one end of the layer 4 from the remaining layers. Two blades 5 are placed, one on each side of the slicing opening 2, in order to separate the edges on both sides of the layer 4 from the rest of the web.

The paper stock mechanism includes means for transporting the separated edges to a suitable container or stock utilization device.

These means consist of side wall assemblies provided to define the actual conduit, shown generally at 8 in FIGS. 1 and 2.

For example, these are the top and bottom walls and side walls 11. of FIG. 3, respectively.
12 and 13, which define a rectangular cross-section conduit with a lower wall that receives the edge 14 of the layer 4 as it is separated from the rest of the web.

The blade 5 is conveniently fixed to one of the side walls 13 of the conduit already illustrated.

Conduits made in this way are
It is open to a collection hopper 15 (FIGS. 1 and 2) provided for conveying the waste to a predetermined area.

The device comprises means for adjusting the width of the edge separated from the web/laterally adjusting the position of the blade in the direction of the lateral force. These means consist of a flat guide plate 16 (FIG. 3) fixed to the frame of the headbox and a slide plate 17 which can slide on the guide plate iiJ, to which the walls 11, 12, 13 and the blade 5 are attached. The Japanese text is fixed. When the edge plate 17 is tightened, a slot 18 into which the shaft of the cap screw 19 is inserted is held in place. Furthermore, the wall assembly is board 20
(FIG. 2), and this plate can be fixed in a predetermined position with respect to the rod 21 by means of a cap screw 22 inserted in a slot 23. During 3° operation, the plate is shown in FIG. One or more headboxes, indicated at 31, can be attached to the advancing wire so that fiber suspension layers 32 and 35, respectively, are delivered, as shown in FIG. The second layer is deposited directly on top of the previous layer.

In accordance with the concepts of the present invention, the edge separation features are located at 34 and arranged to separate the edges from the second layer.

This arrangement is connected to the headbox 31, and it is possible to combine dimensionally similar devices in other headboxes 30, or to install one device in the headbox 30 and one device in the headbox 31. It can also happen. Two or more headboxes to create a multi-layer /-1.
A production line consisting of a separation mechanism, such as device 34, in combination with one or many head boxes may be employed.

In the example illustrated in FIG.
The headbox 3I is deposited on top of the layer 32 deposited by the headbox 3I. As soon as the layer 35 emerges from its slicing opening, the ends are separated by the action of the blade 5 of the device 34. The end (lateral slit l-1 apart from the central main web) is indicated by the lug 14 (FIG. 3). The edges consist of irregular edges, and the +1 center web has four straight and regular remaining edges. The removed strip is wall 1
1. The web is combed 2 through a conduit 8 made up of 12 and 13 to a recycling area, where it is deposited on the previously produced layer 32.

A web consisting of two layers produced in this way passes through zone 3G and is oriented such that a suitably oriented water jet 37 separates the edges of the first layer in the usual manner. .Thus, when two layers are made from different fibers, the cut fibers ♀U, the ends are separated for reuse.The remaining multilayer web has uniform straight edges. ing.

Also, if the first head box is equipped with a separating device 3.1, the layer 32 formed downstream of the second head box 31
The web consisting of and 35 is already completely edge-constant, so there would be no need to use conventional equipment including jets 37.

In accordance with the present invention, it is not possible to obtain perfect regularity of the resulting web edge tone no matter how many layers make up the web, and it is usually not possible to obtain perfect regularity of the resulting web edge tone. In other words, it is possible to obtain the fibers of each layer that are collected in other fibers (1). has advantages.

It is intended to cover similar methods and constructions within the spirit and scope of the invention.

[Brief explanation of drawings]

FIG.
Figure 2 is a diagram showing schematically the part of the paper machine in which the mechanical nib of section I is formed and one of these layers is cut out.1. Wire, 2... Slice opening, 3... Head box 4... Layer, 5... Blade, 6... rJGJ part cutting edge, 7... Front end, 8... Conduit, 11... Lower wall, 12・・・
Upper wall, 13... (I', ll wall, 14... strip,
15... Collection information: -, +6... Guidance counter, J7...
Sliding plate, 18... Slot, 19... Holding screw, 2o
・・Plate, 21・・I<(, 22・・Press screw, 23・・
Slot, 30, 3] ...Hethox, 32...
Layer, 34... ψ1 "1,; Partial front mechanism, 35... Layer, 3
6. Area, 37. Water jet.

Claims (1)

[Claims] The stock flowing out of the slice opening in the headbox is
A method of controlling the edge of a paper web formed on an advancing forming wire by separating the edge of a layer of stock as it exits a slicing opening and collecting the separation of said edge. How to patent something.