JPS6270034A - Double 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 [Field of Industrial Application] The present invention relates to a double facer with an improved heating device.

[Conventional technology]

The conventional technique will be explained with reference to FIG. FIG. 4 is a sectional view showing the overall structure of the double facer. Code 1 in the diagram
indicates a single-sided corrugated cardboard box 1, which is made by a single facer as a pre-process (not shown) and transferred between double facers. At this time, starch glue 4 is applied by the glue machine 3 to the corrugated top IA of the corrugated core cord of the single-sided corrugated gale 1. On the other hand, the symbol 5 in the figure is a liner, and the liner 5 is! It is preheated by the reheater 6 and transferred into the double facer I.

That is, inside the double facer 1, the single-sided corrugated gale 1 and the liner 5 are bonded and integrated via the starch glue 4.

Single-sided corrugated goal 1 and liner 5 inside double facer l
In the heating part 7, the material is held between a belt 9 driven by a roll 8 and a heating belt 10, and is transferred under pressure by a weight roll 11. When passing through the heating part 7, the starch paste 4 gelatinizes due to the heating of the starch 10, which has high-temperature steam inside. As a result, one-sided cardboard 1 and liner 5
are glued together to form a double-sided corrugated board 12. Then, this double-sided cardboard 12 is placed on a belt 9 in a coolift fA-t 13.
．． 15 and the weight rolls 11 as shown in the figure, and then transferred to the next process.

[Problem that the invention seeks to solve]

In the above configuration, the weight roll 11 is intended to apply pressure to the double-sided corrugated board 12 and at the same time promote heating in the heating part 7, but it has the following problems.

In other words, the amount of heat required to gelatinize the starch glue 4 depends on heat conduction from the heating box 10 through the liner 5.
Since the thermal conductivity of the liner 5 is low, it is necessary to keep the temperature of the liner 5 itself above the gelatinization temperature. Approximately 70% of the steam power supplied to the TSUFC 0 is used for heating to heat the liner 5, and there has been a demand for improvement.

The present invention has been made based on the above points, and its purpose is to provide a double facer that can improve the heating mechanism, eliminate uneconomical heat consumption, and reduce costs. It is in.

[Means for solving problems]

That is, the double facer according to the present invention is a double facer in which a single-sided corrugated goal coated with glue on one side and a liner are introduced and bonded together under pressure and heat to form a single double-sided corrugated layer. An electrode roll and a grid electrode are arranged to sandwich the liner, a voltage is applied between these electrode rolls and the grid electrode to generate an electric field, and the single-sided corrugated goal and the liner are bonded by dielectric heating caused by the electric field. It is characterized by the fact that

〔effect〕

Therefore, only the amount of surface heat required for gelatinization can be supplied, eliminating the need for the amount of heat conventionally consumed for liner heating.
Energy consumption can be effectively reduced. In addition, since the electrode roll maintains the conventional pressurizing function, the adhesive strength is not impaired and the effect is great.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. It should be noted that the same parts as in the prior art are denoted by the same reference numerals and the explanation thereof will be omitted. That is, in this embodiment, in the heating box 4-) 20F, a grid electrode 121 is provided in place of the conventional heating box, and an electrode roll 12 is added to the conventional weight roll with an electrode function.
2. Further, the belt 123 is an insulating belt.

The electrode roll 122 has the same size as a conventional weight roll, and has an electric brush 122 as shown in FIG.
Rotate in the direction shown by the arrow in the figure while making contact with the It should be noted that there are various types of electricity supply materials other than the electric brush mentioned above. The grid electrode 121 is embedded in nine traps of an insulator 126 fixed to a ground base 125, as shown in FIG. 3, and the portion where the electrode 121 is not embedded is covered with the electrode roll. 122 and is in contact with the corrugated goal paper.

The operation of K will be explained based on the above configuration. Electrode roll 1
By applying high frequency heating between the electrode 22 and the grid electrode 121, electrolysis occurs in the direction indicated by the arrow in FIG.

Due to the dielectric heating caused by the electrolysis, the step is a
Nine fevers occur in proportion to ta a.

However, C: electrical constant - δ: n electrical loss coefficient. At that time, the value of gtm'c (gtm'c) is about 20 to 30 higher than the water content in the starch glue 4 and the cardboard, and the resulting electrolysis concentrates on the water in the adhesive part of the starch glue 4. This enables highly efficient heating drying.

According to this embodiment, the following effects can be achieved.

(1) First, conventional heating uses a grid electrode 121 and an electrode roll 1 instead of steam heating using Tux.
22, it becomes possible to supply only the amount of heat necessary for gelatinization. Therefore, the heat conventionally consumed for heating the liner is no longer necessary, and energy consumption can be reduced.

(2) Next, the electrode roll 122 performs the pressurizing action as before, and the quality of the starch paste 4 permeating into the paper is maintained as before. Therefore, there is no problem with adhesive strength, etc.

(3) Furthermore, it is possible to selectively heat only the lateral portions, and the manufacturing speed (corrugated paper feeding speed) can be effectively increased. Furthermore, it goes without saying that the length of the apparatus can be shortened if the cardboard paper feeding speed is the same.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, various arrangements and shapes of the grid electrode, insulating material, and grounding base can be considered.

[Brief explanation of drawings]

1 to 3 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a sectional view of a double facer, FIG. 2 is an enlarged view of a part of FIG. 1, and FIG. 3 is a heating A perspective view showing the mechanism, and FIG. 4 is a sectional view of a conventional double facer. 1... Single-sided step-rule, mutual... double facer, 4...
... Starch glue, 5... Liner, 107... Heating part, 121... Grid electrode, 122... Electrode roll. Memories!

Claims (1)

[Claims] In a double facer, a single-sided corrugated board coated with glue on one side and a liner are introduced and bonded together under pressure and heat to form a double-sided corrugated board. Electrode rolls and grid electrodes are arranged to sandwich the single-sided corrugated board and liner. A double facer characterized in that a voltage is applied between the electrode roll and the grid electrode to generate an electric field, and the single-sided corrugated board and the liner are bonded by dielectric heating caused by the electric field.