JPS5896540A - Lower stage roll of single facer - 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 single facer lower corrugating roll for manufacturing corrugated board.

In the conventional single facer, as schematically shown in FIG. 1, eight sheets of paper 7 are fed to the upper roll L side, are caught in the meshing part of the upper roll 1 and the lower roll 2, and are formed into a wave shape. The first eight sheets of paper 7 are transferred as the lower roll 2 rotates, and the glue in the glue container 6 is transferred to the glue-applied roll 4 (after being picked up and the glue film is adjusted by the meter roll 5).

Gluing is applied to the tops of the eight sheets of paper 7 by the gluing roll 4.

On the other hand, the liner 8 and the glued paper 7 fed together to the pressure roll 8 side are adhered to the lower roll 2 and the pressure part of the pressure roll 8 to form a single-sided corrugated board sheet 9.

And conventional upper and lower rolls! , 2 have the following disadvantages because the cross section of the top of the step is circular. When paper 7 and liner 8 are compressed between lower roll 2 and pressure roll 8, which consist of conventional corrugation tops with circular cross-sections as shown in Fig. 2, paper B has a sharp rise as shown in the model of Fig. 6. A pressure P is applied, and the maximum pressure becomes extremely large. In the same figure, A is a model representing the top of the lower roll 2, B is a model representing a combination of 8 sheets of paper 7 and liner 8, W is the nip pressure applied between the lower roll 2 and the pressure roll 8, P represents the contact pressure distribution generated on paper B. Further, the symbols just mentioned represent the same things in FIG. T and FIG. 8, which will be described later.

Therefore, for the above reasons, conventional corrugated rolls are extremely prone to paper breakage during lamination.

This not only reduces the quality of the corrugated board, but also generates waste paper, which increases cost and reduces operational efficiency.

The present invention is characterized in that the top of the second stage is made flat or slightly flattened, and its purpose is to provide a single-faced lower roll that eliminates the conventional drawbacks with an extremely simple structure. It is something.

Since the present invention is constructed as described above, the contact pressure distribution applied to the paper is flattened and does not rise sharply as in the conventional case, so that the maximum contact pressure is significantly reduced.

Therefore, the paper breakage that occurs during the production of one corrugated board is significantly improved, the occurrence of waste paper is also significantly reduced, and there are effects such as improving the quality of the corrugated board and improving its yield.

Next, the embodiment shown in FIG. 8 will be described as the most preferred embodiment of the present invention.

In Fig. 8, 1 is the upper roll, 2 is the lower roll,
The top of the lower roll 2 is flat as shown in FIG. 4(A), and in this embodiment, the bottom of the upper roll 1 is flat as shown in FIG. 4(B). It is like this. Note that 7 in FIG. 8 indicates 8 sheets.

When the top of the lower corrugating roll 2 is made flat as shown in this embodiment, the pressure distribution applied to the paper B becomes flat as shown in FIG. 7, and the maximum contact pressure can be significantly reduced.

Therefore, when the paper 7 and the liner 8 are laminated between the lower roll 2 and the pressure roll 8 shown in FIG. The quality of the products can be improved, and the effect of improving operational efficiency and costs is also significant. Furthermore, since the force with which the top of the lower roll comes into contact with the surface of the pressure roll is weak, it is possible to prevent noise generation due to contact between the two as in the prior art.

In this embodiment, the top of the lower roll 2 and the bottom of the upper roll 1 are made flat, but the radii of curvature of the top and bottom of the above-mentioned steps can be made thicker (and even more flat). .

Figure 5 (a) shows the radius of curvature of the top of the lower roll, which is thicker than the conventional radius of curvature (the top of the roll is close to flat), and Figure 6 (b) shows the radius of curvature of the top of the lower roll. In order to correspond to this, the bottom surface of the corrugated bottom of the upper corrugated roll is formed into a flat shape, and according to this embodiment, as shown in FIG.
The pressure distribution applied to the pressure is more gradual than in the conventional example shown in FIG.

Therefore, this embodiment can also exhibit the same functions as the embodiments shown in FIGS. 8 and 4.

In addition, in each embodiment P1 described above, the cross-sectional shape of the corrugated bottom of the upper corrugated roll 1 is made to correspond to the cross-sectional shape of the corrugated top of the lower corrugated roll 2, but the corrugated bottom of the upper corrugated roll has the same shape as the conventional example, and the lower corrugated Even if only the step top portion of the roll is formed into a flat or flat shape, the same effects as in each of the above-described embodiments can be obtained.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view of a conventional single facer, Figure 2 is a schematic cross-sectional view of a conventional single facer;
The figure is an enlarged cross-sectional view of the roll section in Figure 1, Figures 8 and 4 show an embodiment of the present invention, and Figure 8 is a cross-sectional view corresponding to Figure 2, showing the state of 8-sheet stacking. Explanatory drawings, FIG. 4(A) is a cross-sectional view showing the top of the lower roll, FIG. 4(B) is a cross-sectional view showing the bottom of the upper roll, and FIG. 5 is another embodiment of the present invention. FIG. 6(a) is a cross-sectional view showing the flute top of the lower roll, FIG. 6(b) is a cross-sectional view showing the flute section of the upper roll, and FIG. 6 shows the pressure distribution state of the conventional example. Explanatory diagram showing, No. 7
The figure is an explanatory diagram showing a pressure distribution state in one embodiment of the present invention, and FIG. 8 is an explanatory diagram showing a pressure distribution state in another embodiment of the present invention. 1... Upper roll, 2... Lower roll. Agent Kumima Sakai? to

Claims (1)

[Claims] A single facer lower roll characterized by having a flat or almost flat top part.