JPS6075696A - Headbox 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] The present invention relates to a paper machine headbox.

The paper machine head box injects pulp liquid in an Rv shape onto a moving wire mesh, but since it is only a conventional method, the direction of fiber arrangement is not sufficiently controlled, and the pulp liquid (3) is Many of them are difficult to prevent from flocking. In particular, when the paper stock density increases, the fiber flock becomes stronger and the number of fibers in the thickness direction of the paper increases, which tends to make the paper bulky and reduces the strength of the paper.

The present invention provides a paper machine head box that solves the above problems, and its feature is that the inner surfaces of the upper and lower slices constituting the head box body are lined along a direction perpendicular to the pulp liquid jetting direction. The fin-like projections are provided at appropriate intervals to form a groove-like flow path, and the upstream end surface of each of the fin-like projections is sloped. According to this configuration, the pulp liquid flow path in the head box has a fin-free flow path near the center of the head box and a groove-like flow path between the fins. By combining these flows in narrow parallel channels, the fibers can be arranged in a direction along the jetting surface of the bulk liquid. Even if the paper stock concentration is high, the fibers in the paper thickness direction can be It is possible to reduce this and prevent bulkiness. Furthermore, since fiber flocking can be prevented, the strength of the paper can be improved.

Furthermore, since the upstream end surface of each protrusion is inclined,
There is no chance of fibers getting caught on protrusions or clogging latent channels.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 5. In other words, fin-like protrusions (4) and (5) are provided on the inner surfaces of the upper and lower slice walls (1) and (2) at intervals along the direction perpendicular to the pulp liquid injection plane, and a narrow latent channel is formed between them. is formed. The upstream end surface (4AX5A) of each projection (4) (5) is inclined. Protrusion (4)
(5) They should face each other as shown in Figure 5.
It's related to iffi.

In the above IN configuration, on the upstream side of the protrusion (4) <5), the arrangement direction of the a fibers (6) of the pulp liquid (3) is a rotational axis along the pulp liquid injection direction, and the pulp liquid injection direction (5). are considered to be equal in the (■ axis along the orthogonal direction) and the (Z) axis along the paper thickness direction. However, the flow path (7) between the protrusions (4) and (5) near the center of the head box
), the fibers are aligned in the XY direction, and there are still protrusions (
4) In the narrow latent channels (8) between each of (5), the fiber arrangement direction is aligned with the X2 plane. Next, the pulp liquid (3) that passed through the center channel (7) and the fM-shaped channel (8)
The fibers (6) that were arranged along the (Z) axis direction are rearranged in the (X) axis direction due to the speed difference caused by the merging. Therefore, in the injection port (9), the arrangement of fibers in the (X) (Yl axis direction) increases, and the bulk does not increase.
0, and the flow of the pulp liquid (3) sprayed in a thin film form from the spray nozzle (9) is not disturbed. Furthermore, since the upstream end faces (4A) (5A) of each protrusion (4) (5) are inclined, the fibers (6) may get caught or become clogged with each protrusion (4) (5). do not have.

In the above embodiment, the upper and lower projections (4) and (5) are opposed to each other, but the same effect can be achieved even if the upper and lower projections (4) and (5) are shifted from each other as shown in FIG.

As described above, according to the present invention, the pulp liquid flow path in the head box has a central flow path and a latent flow path between the fins, and the fiber arrangement direction of the pulp liquid flowing through each flow path is parallel to the flow path surface. It can be arranged.

By merging these channels, the fibers of the pulp are aligned in the direction in which the pulp liquid is ejected, and even if the paper stock concentration is high, the fibers in the paper thickness direction can be reduced. This can prevent it from becoming too bulky. It can prevent the loose fibers from forming flocs and improve the strength of the paper. Furthermore, since the upstream end surface of each protrusion is inclined, there is no possibility that the fibers will get caught in the protrusion and become clogged.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional example, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a longitudinal sectional view, Fig. 3 is a perspective view, and Fig. FIG. 5 is a vertical sectional view showing the arrangement direction, and a view taken along the line V-■ in FIG. 2 from FIG. Figure 6 is a cross-sectional view showing another embodiment of the present invention. (1) (2)...nullite wall, (3)...pulp r&, (4) (5)...protrusion, (())...fiber, (7)...center channel , (8)... latent channel, (
9... Injection port flow path agent Hiroshi Karimoto

Claims (1)

[Claims] ■ Fin-like protrusions are provided at appropriate intervals along the direction orthogonal to the pulp liquid jetting direction on the inner surface of the upper and lower slices that form the head box body at 4't+￥, thereby forming a groove-like flow path and a center flow path. (a) A head pocket for a paper machine machine, characterized in that a parallel portion is provided in the outlet jet flow path where both flow paths merge, and the upstream end surface of each protrusion thereof is inclined σ.