JPH03213593A - Paper making - Google Patents

Abstract

PURPOSE:To obtain paper having no difference in strength between longer direction and width direction by reversing direction of projection based on wire traveling direction when jet direction fed from head box is projected on wire. CONSTITUTION:In feeding paper making raw material in a sprayed state 1 from a head box to a traveling wire, when direction of spray flow fed from the head box 2, namely jet direction Dj is projected on the wire 3, the direction of the projection is reversed based on wire traveling direction Dw so that orientation of prepared paper has no difference in longer direction and width direction and anisotropy of paper strength is extremely improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper making method in a paper making machine.

(Prior Art) Fig. 5 shows a conventional paper making method. A paper making raw material 1 is supplied from a head box 2 to a wire 3, and is dehydrated by a shoe 4 or the like to form a paper layer. The wire 3 is guided and supported by a breast roll 5, a guide roll 6, etc. Furthermore, if the direction in which the raw material 1 is supplied in a jet form from the hesitobox 2 (jet direction D17) is projected onto the wire 3, it is parallel to the running direction of the wire 3 (wire direction D88).

(Problems to be Solved by the Invention) In FIG. 5 showing the conventional papermaking method, the jet direction 7 is parallel to the wire direction 8, and therefore the orientation of the fibers in the papermaking raw material 1 is There are many things that point in the same direction. If the statistical tendency of these fiber directions is called orientation, this orientation is strong in the wire direction, 8, and weak in the width direction.

Therefore, paper made using conventional papermaking methods has the characteristic of being strong in the longitudinal direction but weak in the width direction.

On the other hand, for copying paper and the like, it is desirable to use paper that has the same strength in the longitudinal direction and the width direction, and there has been a desire for improvement in conventional paper making methods.

The present invention aims to provide a papermaking method that improves the orientation of fibers and reduces the anisotropy of paper strength (difference in strength between the longitudinal direction and the width direction).

(Means for Solving the Problems) For this reason, the present invention provides a papermaking method in which papermaking raw materials are supplied in a jet form from a head box onto a wire running, in which the direction of the jet flow supplied from the head box, that is, the jet direction is When projected onto the wire, the direction of the projection is opposite to the wire running direction.
This is a means to solve problems.

(effect) The fibers are oriented in the jet direction in the headbonx.

The winner is the one that aligns with the . In the present invention, the jet direction is reversed from the conventional one, and the raw material ejected from the head box lands on the wire and is suddenly changed direction by an angle of 180°-θ, disrupting the flow and changing the orientation inside the head box. Collapse. Therefore, the orientation of the produced paper is not much different between the longitudinal direction and the width direction, and the anisotropy of the strength of the paper is greatly improved.

(Example) The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a first embodiment, and FIG. 3 shows a second embodiment.

First, in the embodiment shown in FIG. 1, the jet direction from the head box 2, 7b, is opposite to the wire direction D88. The thickness of the raw material jet from head box 2 is approximately 5-25
mm, and when the lower part of this jet comes into contact with the wire 3, the direction of movement changes drastically by 180-θ° due to the wire 3. The upper part of the jet exerts inertial force and tries to maintain the jet direction of 7, so a shearing force is generated within the jet. The orientation of the fibers changes due to flow disturbance caused by this shearing force. Therefore, by adjusting the jet direction and the angle θ between 8, D, and 7, the orientation of the paper can be controlled.

FIG. 3 shows an embodiment in which, in addition to the first embodiment, a smooth plate 9 is provided to eliminate unevenness on the surface of the papermaking raw material 1 that has landed on the wire 3L. FIG. 4 is a side view of the smooth plate part, and the smooth plate 9
changes position depending on the thickness of papermaking raw material I (not shown)
Further, the shape is not limited as long as the papermaking raw material 1 is sandwiched between the wire 3 and the smooth plate 9.

(Effects of the Invention) As explained in detail above, the present invention is such that when the jet direction of the papermaking raw material is projected onto the wire, the projected direction is opposite to the wire running direction, so that the fiber orientation is It is possible to obtain an unprecedented and effective paper making method in which the properties can be changed according to the needs of the paper.This makes it possible to easily produce copy paper, etc., where anisotropy in paper strength is a problem.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a paper machine implementing the paper making method of the first embodiment of the present invention, FIG. 2 is an explanatory diagram showing the relationship between the jet direction and the wire direction in FIG. 1, and FIG. A perspective view of a paper machine that implements the paper making method of the second embodiment, FIG. 4 is a side view of the main parts in FIG. 3, and FIG. 5 is a perspective view of a paper machine showing a typical example of the conventional paper making method. It is. Explanation of main parts of the figure ■ Paper making raw material head box wire shoe jet wire direction D1. I Patent Applicant Figure 1, Figure 2, j, Figure 3, and 4/Unexamined Patent Publication No. 3, 213593 (3), Figure 4, Figure 5

Claims (1)

[Claims] In a papermaking method in which papermaking raw materials are supplied in a jet form from a head box onto a wire running, when the direction of the jet supplied from the head box, that is, the jet direction, is projected onto the wire, the direction of the projection is the wire running direction. A paper making method that is characterized by going backwards.