JPS6270031A - Corrugator - 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] [Industrial application field 1 The present invention relates to improvements in corrugators.

[Prior Art] A conventional example will be described with reference to FIGS. 8 and 9. 8th
The figure shows a single phase element configuration.

A single-sided corrugated board 2 is manufactured on this single facer, and the manufactured single-sided corrugated board 2 is introduced into a double facer 3- shown in FIG. 9 to become a double-sided corrugated pole, and is conveyed to the next step (not shown). The center mark @5 in FIG. 8 is an upper roll, and the outer surface of the upper roll 5 is formed into a tooth shape. A lower roll 6 whose outer surface is also formed into a tooth shape meshes with the upper roll 5. A pressure roll 7, a pasting roll 8 and a doctor roll 9 are installed below the lower roll 6, and the outer surfaces of the pressure roll 7, pasting roll 8 and doctor roll 9 are as follows:
Finished with a smooth surface.

Note that the reference numeral 10 in the figure is a container containing the starch paste 11. The pressure roll 7 is pressed against the lower roll 6 with a predetermined nip pressure, and the glue roll 8 is pressed against the lower roll 6.
, and the doctor roll 9 is in contact with the pasting roll 8. Further, the lower end of the glue roll 8 is connected to the container 1.
It is immersed in starch glue 11 in o.

According to the above configuration, the core paper 11 supplied from the upper roller 5 side is bitten by the meshing portion of the upper roll 5 and the lower roll 6 and deformed into a wave shape. Core paper 11 transformed into a corrugated shape
is transferred in the direction shown by the arrow in the figure by the rotation of the lower roll 6, and the pasting is carried out via the roll 8 at this time. The amount of glue applied at this time is adjusted by the doctor roll 9.

The core paper 11 glued to the top portion 11A of the step is adhered to the liner 12 supplied from the pressure roll 7 side, and
It is continuously carried out as single-sided corrugated cardboard 13. This single-sided corrugated board 13 is introduced into the double facer 31.

This double facer β- will be explained below.

The single-sided corrugated board 13 has a corrugated top portion 13A of its wavy core string.
A starch paste 22 is applied by a glue machine 21 and introduced into the double facer 3-. On the other hand, the liner 23 is preheated by the preheater 24 and introduced into the double facer 1 in the same way. The double facer coat consists of a heating bar 25 and a cooling bar 26, and when the single-sided cardboard 13 and liner 23 pass through the heating bar 25, they are heated by a heating box 27 containing high-temperature steam inside. . By this heating, the starch glue 22 is gelatinized, and the single-sided corrugated board 13 and the liner 23 are bonded together, forming a double-sided corrugated board 28. This double-sided corrugated cardboard 28' is conveyed while being held between belts 29, 30 and weight rolls 31, and is conveyed to the next process (not shown). Note that the reference numeral 32 in the figure is a roll. In addition, at this time, the weight roll 31 also has the function of applying pressure to the single-sided corrugated board 13, and the desired adhesive force is obtained by the pressurizing action.

[Problem that the invention attempts to solve] According to the above configuration, there were the following problems.

(1) First, in order to finally produce double-sided corrugated board 28, two processes are required: single facer and double facer 3-, which requires more space for installing the equipment, and due to the nature of corrugated board, the line length is long. Therefore, the number of rolls and hot plates required is also increased.

(2) Heating in the heating bar 25 is performed using steam in the heating box 27, and at that time, 70% of the heat is consumed for heating the liner 23, and the heat that actually contributes to gelatinization is the entire amount. This is about 30% of the total energy consumption, which is a problem in reducing energy consumption.

(3) Furthermore, there was a problem in that large noise was generated at the contact portion between the lower roll 6 and the pressure roll 7 on the single facer.

The present invention has been made based on the above points, and its purpose is to provide a corrugator capable of solving the above-mentioned problems, simplifying the process, reducing energy consumption, and suppressing noise generation. Our goal is to provide the following.

[Means for Solving the Problems] That is, the corrugator according to the present invention consists of an upper roll and a lower roll, each having a gluing mechanism, and a core paper is introduced between the upper roll and the lower roll to form a corrugator. and a step-up/glue mechanism for applying glue to both sides, a core paper from the step-up/glue mechanism, and a pressure mechanism that introduces a pair of liners to both sides of the core paper and pressurizes them; A core paper and a pair of liners pressurized by this pressure mechanism are introduced, and a high frequency voltage is applied between the grid electrodes arranged to sandwich the core paper and pair of liners, and the electric field generated at that time causes a dielectric The present invention is characterized by comprising a heating mechanism for heating, and a conveying mechanism for conveying the core paper and the pair of liners between the tiering/gluing mechanism, the pressing mechanism, and the heating cutting mechanism.

[Operation] In other words, glue is applied to both sides of the core paper by the upper roll and lower roll, each having a gluing function, and liners are pasted on both sides of the core paper and pressurized by the pressure mechanism, and heated by the heating mechanism to form the corrugated board. Manufacture.

In this case, the heating mechanism uses a grid electrode, applies a high frequency voltage to the grid electrode, and performs dielectric heating by the electric field generated at that time.

[Effects] Therefore, the structure is one in which the conventional single facer and double facer are integrated, and the structure as a corrugator is greatly simplified, and the line length can be shortened. In addition, the heating method is not the conventional heating using steam, but dielectric heating using a high-frequency voltage application using a grid electrode, so the amount of heat that was conventionally required for liner heating is unnecessary, and highly efficient heating can be performed. It is possible to reduce energy consumption. Furthermore, since the single facer pressure roll, which conventionally caused noise generation, is not required, noise generation can be effectively suppressed.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. 1 is a diagram showing the configuration of a corrugator according to this embodiment. The corrugator according to this embodiment is a combination of a conventional single facer and a double facer,
In the figure, numerals 101 and 102 are liners, respectively, and numeral 103 is a core paper. The liner 101 is introduced into the apparatus by rolls 104 and 105, and the liner 102 is fed into the apparatus via a belt 107 by driving an roller 106. The belt 107 is made of Teflon, for example. On the other hand, the core paper 103 is formed into a wave shape by an upper roll 111 having a gluing function and a lower roll 112, and starch glue is applied to both sides thereof. −
Note that the circumferential speeds of the upper roll 111 and the lower roll 112 are set to be slightly faster than those of the rolls 104 and 106. The rolled core paper 103 falls onto the liner 102 in a bent state due to the speed difference mentioned above. Then, the vehicle travels together with the liner 102 in what is called a kissing touch with the liner 102.

The gap between the roll 105 and the roll 115 is set in consideration of the finished dimensions of the corrugated pole, and the gap between the roll 115
The liner 101 is kissed onto the core paper 103 at the position , forming the shape of a cardboard. The formed cardboard is transferred to a pressure mechanism 121 and is pressed by a pressure roll 122 via the belt 107, thereby promoting the penetration of the glue into the paper. Here, as a means for pressurizing, in addition to using a pressurizing roll, for example, a pressurizing method using air pressure can be considered. The pressurized cardboard is then conveyed to the heating mechanism 131. In this heating mechanism 131, a plurality of grid electrodes 132 are arranged above and below the belt 107, and the high frequency electric field generated by these grid electrodes 132 generates internal heating, reduces the water content in the glue, and dries the glue by gelling it. is promoted. This heating by the heating Toyohashi 131 results in a double-sided corrugated cardboard 141, which is then conveyed to the next step (not shown).

Note that the reference numeral 142 in the figure is a roll. The above is the overall configuration of the corrugator according to this embodiment.

Next, the configuration of each part will be explained in more detail.

First, the configurations of the upper roll 111 and the lower roll 112 will be explained. FIG. 2 shows how the core paper 103 is formed into a wave shape by the upper roll 111 and the lower roll 112, and FIG.
FIG. Note that the configurations of the upper roll 111 and the lower roll 112 are the same. Reference numeral 151 in FIG. 3 is an inner cylinder, and this inner cylinder 151 allows the upper roll 1 to be accessed from the outside.
Supply glue to the inside of 11. Reference numeral 152 is a glue supply header that supplies glue to the troughs between the teeth of the upper roll 111 via a guide and a slit 153 of the upper roll 111, which will be described later. The inner cylinder 151 has an upper roll 1
A diaphragm is provided so that the glue is uniformly supplied in the width direction corresponding to the effective width of 11, and slits 154 are formed at four locations in 111151 according to this embodiment. In addition to the slit 154 described above, various methods of forming a round hole can be considered as means for forming the aperture. The glue supply header 152 also has a slit 155 formed at one location in the circumferential direction. A guide 156 is attached to the slit 155, and a gap is formed between the tip of the guide 156 and the outer circumference of the upper roll 111. In addition, the reference numeral 157 in the figure is the inner cylinder 151.
It is a support member that supports. The above is the configuration of the upper roll 111, and as described above, the lower roll 112 also has the same configuration. And these upper rolls 11
1 and the lower roll 112, it is necessary to position the guide 156 at a portion where the teeth of both rolls 111 and 112 mesh.

In such a configuration, the core paper 103 is attached to the upper roll 111.
When the glue is introduced into the hollow part 161 of the inner cylinder 151 of the upper roll 111 and the lower roll 112, the glue is introduced between the slit 1 and the lower roll 112 and formed into a wave shape.
54 into the space 1111162 between the inner cylinder 151 and the glue supply header 152, and roughly passes through the guide 156 and slit 153 to reach the top of the step of the core paper 103.

At that time, the guide 156
Since the glue is located in a non-rotating state in the meshing part of the upper roll 111 and the lower roll 112, the glue is always supplied only from the position passing through the guide 156. As a result, the upper roll 111 and the lower roll 112
There is no leakage of glue from areas other than the interlocking areas. The excess glue then flows out into the space 164 through the gap 163 between the guide 156 and the outer periphery of each corrugating roll 111 and 112. Then, it flows out from the end of this space 164 and is circulated. The amount of glue supplied is controlled by the glue supply pressure and the gap setting of the slit 153.

Next, the configuration of the heating mechanism 131 will be explained.

In FIG. 4, the grid electrode 132 is arranged only on one side for the sake of explanation, but the same applies to the other sides. The heating mechanism 131 of this embodiment is composed of the belt 107 and a plurality of grid electrodes 132, as described above. The belt 107 is
It has the property of having a small value of ε·tan δ.

However, ε: relative dielectric constant, tan δ: dielectric loss coefficient. Further, the grid electrode 132 is arranged at an inclination angle θ with respect to a direction perpendicular to the direction of flow of the cardboard (the direction indicated by the arrow in the figure). Furthermore, the grid electrode 132 includes a (+) electrode supported by the instantaneous body 171 and a −) electrode that is grounded, and these pair of electrodes constitute one unit. In the case of this embodiment, a pair of electrodes constituting one unit are located on the same side of the cardboard sheet. A high frequency voltage is then applied between these two electrodes. The application of the high frequency voltage generates an electric field as indicated by the arrow X in FIG.

Due to dielectric heating caused by this electric field, E2 ・ε
・Heat is generated in proportion to tan δ・f.

however E: Electric field strength f; frequency It is.

At this time, when comparing the values of ε and tan δ between the water in the glue and the paper, the water is 20 to 30 times higher, so the electric field generated is at the adhesive part of the glue (indicated by reference numeral 181 in Figure 5). This results in extremely efficient heating and drying. The reason why the grid electrode 132 is installed at a certain inclination angle θ with respect to the direction perpendicular to the direction of flow of the cardboard is as follows. In other words, there is a difference in the degree of concentration of the electric field between directly above and in the middle of the grid electrode, and if the corrugated pole is flimmed parallel to the flow direction, a temperature distribution will occur in the width direction of the corrugated board, resulting in uneven adhesion. That's because it is. In order to further increase the heating efficiency, it is necessary to take measures as shown in FIG. Grid electrode 13
If the inclination angle of 2 is θ, then the pitch P of the grid electrodes 132 needs to satisfy the following equation.

P≦La1n −sinθ However, it is the paper width that can be manufactured, and 1 akin is its minimum value. By doing this, glue 1! Jl (indicated by thick lines in FIG. 7) is included between the grid electrodes 8i, thereby improving heating efficiency.

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

(1) In the corrugator according to this embodiment, both the upper roll 111 and the lower roll 112 have a gluing function, and the structure is a combination of a single facer and a double facer. There is no need to install the facer and double facer separately. As a result, the configuration is greatly simplified, the length of the line is shortened, and the installation space and costs can be effectively reduced.

(2) Furthermore, since the pressure roll in the single facer, which conventionally caused noise generation, is no longer necessary, noise is significantly reduced.

(3) Also, regarding the heating method, instead of using steam stored in the heating box as in the past, a dielectric heating method using high frequency using the grid electrode 132 is adopted, so that the heating method used for heating the liner is reduced. It is possible to eliminate heat arrogance and provide efficient heating and drying, which is extremely effective in reducing energy consumption m. (4) Furthermore, by improving the heating method described above, it becomes possible to selectively heat only the glue portion, and as a result, the feeding speed of the corrugated cardboard sheet can be increased. Conversely, this means that if the speed is the same as before, the line length will be shortened.

Note that the present invention is not limited to the above embodiments! There are various possible options. For example, the electrode arrangement is 7th.
It may be as shown in the figure, in which pairs of electrode units are arranged on both sides with a cardboard sheet in between. In the case of the above embodiment, a pair of electrodes constituting one unit are arranged on the same side. ), and a configuration in which a high frequency voltage is applied thereto may be used. In this case, an electric field is generated in the direction shown by the arrow in the figure. Therefore, the same effects as in the embodiment described above can be achieved.

[Brief explanation of drawings]

FIGS. 1 to 6 are diagrams showing one embodiment of the present invention.
The figure shows the entire corrugator, Figure 2 is an enlarged view of the upper roll and lower roll, Figure 3 is a cross-sectional view of the upper roll, and Figure 4 is a perspective view showing the arrangement of grid electrodes. Fig. 5 is a diagram showing the action in the heating mechanism, Fig. 6 is a diagram to explain the relationship between the inclination angle of the grid electrode and heating efficiency, and Fig. 7 is a diagram showing the electric bridge arrangement according to another embodiment. , 8th
9 and 9 are diagrams showing a conventional example, FIG. 8 is a diagram showing the configuration of a single facer, and FIG. 9 is a diagram showing the configuration of a double facer. 101... core paper, 102.103... liner, 11
1... Upper roll, 112... Lower roll, 121
...pressure mechanism, 131... heating mechanism, 132...
Grid electrode, 106...roll, 107...belt. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 72 Figure 3 Section 5m 1t Halsey ← Nobu direction 07 Figure 87

Claims (1)

[Claims] The casing consists of an upper roll and a lower roll, each having a gluing mechanism, and a core paper is introduced between the upper roll and the lower roll, and the paper is rolled and glued on both sides.
A gluing mechanism, a core paper from this step-up/glue mechanism, a pressure mechanism that introduces a pair of liners on both sides of this core paper and presses them, and a core paper that is pressurized by this pressure mechanism. and a heating mechanism that introduces a pair of liners and applies a high frequency voltage between grid electrodes arranged so as to sandwich the core paper and the pair of liners, and performs dielectric heating using the electric field generated at that time, and 1. A corrugator comprising a conveying mechanism that conveys a core paper and a pair of liners between an attaching mechanism, a pressurizing mechanism, and a heating mechanism.