JPH01202430A - Single facer - Google Patents

Abstract

PURPOSE:To settle the generations of noise of a single facer and of breakage of paper as material and smoothly response to the change of the load of matter to be heated by a method wherein paste interposing between linerboard and corrugated medium is heated and the operating speed, the amount of the paste at the crest of the corrugated medium and the sheet width are detected so as to control the output of a dielectric heating device on the basis of detection signals. CONSTITUTION:Medium 8 is formed into a corrugated medium 8a by being bitten between an upper corrugated roll 11 and a lower corrugated roll 12. After that, paste 7 is applied to the ridge crests of the corrugated medium 8a with a pasting roll 4 to laminate the medium 8a to a linerboard 9. The linerboard 9 and the corrugated medium 8a are joined by pressing with a belt 14, the pressing force of which is controlled by a tension roll 15. On the other band, heat is generated at the joining part of the corrugated medium 8a and the linerboard 9 due to the electric field generated between grid electrodes 16, 16..., which are adjacent to each other and arranged close to a laminating roll 13 and between which high frequency alternating voltage is applied. When the speed of sheet to be heated, the width of the sheet, the amount of paste adhered and the like change, the load change is detected by respective detectors or their substitute signals and, as a result, an oscillator 24 controls necessary output so as to heat under optimum conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a single facer for manufacturing single-sided corrugated board, which is one unit of a corrugator, which is a nine-sided corrugated board manufacturing facility.

[Conventional technology]

A conventional general single facer employs the structure shown in FIG. In the same figure, 1 is an upper roll, 2 is a lower roll, 3 is a pressure roll, 4iJl attached roll,
5 is a doctor roll, 6 is a glue container, 7 is glue, 8 is a core paper,
8a is a corrugated core paper formed into corrugated steps, 9 is a liner, 1
0 indicates single-sided cardboard.

To explain the manufacturing process of single-sided corrugated board 10 using a mass and single facer, the core paper 8 is supplied between the upper roll 1 and the lower roll 2, and is bitten into the interlocking part of the upper roll 1 and the lower roll 2.

The corrugated core paper 8a is formed into a corrugated shape. Next, the corrugated core paper 8a is transferred as the lower roll 2 rotates, and the glue container 6
The glue 7 inside is scooped up by a gluing roll 4, and glued onto the step top of the υ corrugated core paper 8a by the gluing roll 4, which has undergone glue film adjustment by a doctor roll 5. Thereafter, this glued corrugated core paper 8a is adhered to a liner 9 separately supplied to the pressure roll 3 side at the pressing portions of the lower roll 2 and pressure roll 3 to form a single-sided corrugated board 10.

In the conventional single facer with the above structure, the upper roll 1
is pressed against the lower roll 2, and the pressure roll 3 is pressed against the lower roll 2, respectively.

The former is the pressure required to form the corrugated core paper 8 into tiers, and the latter is necessary to rapidly raise the temperature of the normally used liquid starch paste attached to the top of the tiers of the corrugated core paper 8a to gel it. In order to provide a large amount of heat, the heated pressure roll 3 is pressed at high pressure using the heated steam introduced into the hollow part 3a of the pressure roll 3 as a heat source, and the purpose is to promote heating by heat conduction.

In addition, the lower roll 2 and the upper roll 1 have tooth-shaped steps formed on the outer surface of the roll at equal pitches.

Since one of the pressure rolls 3 has a smooth surface, the top of each stage of the lower roll 2 hits the surface of the pressure roll 3 at high cycles under operating conditions. That is, upper roll 1. The main component of the lower roll 2 and the pressure opening plate 3 is the number of tooth cycles of the upper and lower rolls 1 and 2, which vibrate at the number of revolutions of the first corrugating roll N x the number of teeth Z, and the vibration eigenvalue of the roll system is determined by the number of teeth cycle N- If Z matches, resonance may occur and the three rolls may vibrate violently. During such resonance, the circumferential surface of the pressure roll 3 and the stepped portion of the lower roll 2 collide violently, so a large collision load is applied to the corrugated core paper 8a and the liner 9, which are sandwiched between the rolls 2 and 3. 1
If both papers are broken, depending on the phase of vibration, the linear pressure between the lower roll 2 and the pressure roll 3 may be insufficient, resulting in poor bonding due to insufficient adhesive force.

In addition, the collision between the lower roll 2 and the pressure roll 3 generates a large amount of noise, which is an important problem to be solved in the single facer.

Furthermore, in the above conventional structure, the glue is heated to a gelling temperature (usually around 60°C) at the joint between the lower roll 2 and the pressure roll 3, where the corrugated core paper 8a with glue attached to the top of the second stage and the liner 9 are in a bonded state. ) to heat up to.

As described above, indirect heat supply means uses the hollow part 3a of the pressure roll 3 into which high-temperature steam has been introduced as a heat source and heats the side part by heat conduction and heat transfer through the inside of the pressure roll 3 and the liner 9. are taken. Therefore, in this method, most of the heat energy is spent on increasing the temperature of the white part of the roll and the paper, which do not need to be heated, without directly heating the side parts. During operation, the supply of heat is insufficient, making it impossible to raise the temperature to the gelling temperature of the glue, resulting in poor adhesion. In other words, there is a limit to the speeding up of the conventional structure. Furthermore, in the case of conventional steam heating, the response to the optimum amount of steam supply to changes in operating speed, glue amount, sheet width, etc. is slow, resulting in problems such as overdrying or insufficient drying. Was.

[Problem to be solved by the invention]

The present invention was made for the purpose of eliminating noise and material paper breakage, which are the vibration problems of conventional single facers, and improving the lateral heating means, which is an obstacle to speeding up and saving energy. In the conventional structure, the presence of pressure rolls is the cause of the vibration and heat energy loss due to the board, so we decided to develop and provide a new heating and bonding method. Furthermore, changes in operating speed, changes in the amount of glue, changes in sheet width, etc.

The present invention aims to provide a device that smoothly responds to changes in the load of the heated object.

[Failure to solve the problem]

That is, the present invention includes at least one corrugating roll that engages core paper to form corrugations, a laminating roll that meshes with the corrugating roll, and gluing to the corrugated core paper that is transported along the outer periphery of the laminating roll. Gluing means.

a pressure device consisting of a belt that presses the liner supplied over the stepped core paper onto the bonding roll surface; a pressure device disposed on the back side of the liner and interposed between the liner and the stepped core paper; The dielectric heating device has a dielectric heating device that heats the glue to be heated, a detection device that detects the operating speed, the amount of glue at the top of the corrugated core paper, and a sheet width, and an output adjustment device that adjusts the output of the dielectric heating device based on the signal from the detection device. A single facer is constructed which is characterized by the following features, and this is used as a means for solving the above problems.

[Effect]

The single facer of the present invention has the above-described configuration. As a function of this, first of all, in the pressurizing device for the liner and the core paper, almost uniform pressure is applied to the belt over a fairly wide circumference of the corrugating roll, which is different from the conventional high point pressure. There is no external force that would cause rigid body vibration of the roll. Further, a dielectric heating device is disposed in cooperation with the pressure device, and a stain field is generated by applying a high frequency voltage. This electric field enables dielectric heating. In dielectric heating, the target dielectric has E2・ε・tanδ・f(ε:
Relative permittivity, tanδ: dielectric loss coefficient, f: frequency,
Heat is generated in proportion to the electric field strength (E: electric field strength), but the values of ε and tan δ, which are unique to the dielectric, are much higher in the aqueous glue solution than in the paper, so the electric field generated is Concentrate on the printing department. Therefore, the temperature of one sheet of paper hardly rises, only the temperature of the printing section rises rapidly, and gelation takes place. According to the tests conducted by the inventors, the temperature at the printing section rises by 60 to 80°C during the application time of 0.2 to 0.5 seconds, but the temperature rises by 0.5°C on 9 papers.
does not rise either. In other words.

This method induces internal self-heating of the target part to be heated, rather than heating it using heat conduction or heat transfer as in the past.

In addition, there are factors that act as load factors during heating.

That is, the operating speed, sheet width, amount of glue, etc. are detected by the detection means, and the output adjustment means adjusts the output of the dielectric heating device based on the signals, thereby supplying the optimum amount of heat to the object to be heated.

〔Example〕

Nine embodiments of the present invention will be described below.

FIG. 1 is a schematic side view of a single facer according to the present invention. In the same figure, 11 is an upper corrugated roll;
2 is a lower corrugated roll, 13 is a pasting roll, 4 is a glue roll, 5 is a doctor roll, 6 is a glue container, 7 is glue, 8 is core paper,
9 is a liner, 8a is a corrugated core paper formed into a corrugated shape by being bitten by an upper corrugating roll 11 and a lower corrugating roll 12, and 10 is a single-sided corrugating pole.

14 is a pressure belt, 15 is a tensioner roll for adjusting pressure force, 16 is a grid electrode, and 17 is a guide roll.

Here, the tooth shape of the laminating roll 13 is the same as that of the upper corrugating roll 11.
, and the roll diameter can be set arbitrarily depending on the required heating length.

In addition, the bonding roll 13 is attached to the metal tube 1 for reasons described later.
No. 8, a tooth-shaped outer cylinder made of ceramic or resin (provided it has heat resistance), which has a product of relative permittivity and dielectric loss coefficient (ε・tanδ) that is absolutely smaller than that of water. Attach 19.

The grid electrodes 16 are still arranged adjacent to the circumferential surface of the bonding roll 13 at appropriate intervals.

The grid electrodes are arranged in the axial direction of the laminating roll 13, as shown in FIG. The arrangement of the grid electrodes is not limited to this, but it is also possible to arrange them with a curvature in the circumferential direction as shown in the diagram shown in the diagram. In addition, various methods of arrangement can be considered.

Next, the belt 14 partially covers the liner 9 with the corrugated core paper 8a.
The outer cylinder 19 is surrounded by a desired circumferential length on the circumferential surface of the bonding roll 13 in order to come into pressure contact with the outer cylinder 19 . Further, the tensioner roll 15 is used to adjust the pressing force of the belt 14.

In addition, an operating speed detection sensor 20 and a sheet width detection sensor 21 are arranged facing the liner or core paper, and furthermore, a driving speed detection sensor 20 and a sheet width detection sensor 21 are arranged facing the wavy core paper at a portion passing through the gluing row/L/4 of the core paper. A glue amount detection sensor 22 is provided. All detection signals from these detection sensors 20, 21, and 22 are sent to the computing unit 23. The arithmetic unit 23 receives these signals, performs arithmetic processing, and sends the results to the oscillator 24.
send to

Here, the signal from the driving speed detection sensor 20 may be replaced by a motor voltage or rotational speed signal.

Further, as the sheet width detection sensor 2I, an edge sensor, which is a known optical method, is used.

It is also possible to use an output signal from a computer that is input into the centralized production control system. Further, for the glue amount detection sensor 22, for example, an optical method using reflection of light on the glue surface can be adopted.

When a device with such a configuration is driven, the core paper 8
is blown into the upper corrugating roll 11 and the lower corrugating roll 12 to form a corrugated core paper 8a.

Glue 7 is applied to the corrugated top portion of the corrugated core paper 8a by gluing roller/I/4, and the corrugated core paper 8a is bonded to the liner 9 that is fed separately. By the way, in the above-mentioned bonding part, the liner 9 and the corrugated core paper 8a are pressed and brought into close contact by the belt 14 (the belt 14 rotates together with the liner 9) whose pressing force is adjusted by the tensioner row/v15.

On the other hand, grids 1lii16°16... are arranged close to the laminating roll 13 at the close contact portion between the corrugated core paper 8a and the liner 9.
・By applying a high frequency alternating voltage between.

An electric field is generated between adjacent electrodes. This electric field causes the target dielectric pair to have E2・ε・Lanδ・f (where ε is the relative permittivity, tanδ: dielectric loss constant, f: frequency,
Heat is generated in proportion to E: 1 field strength), but as mentioned above, the heating is concentrated on the printing area, and the temperature of the glue rapidly increases to gel, completing the adhesion. Regarding the material selection of the outer cylinder 19, it is necessary to use a material with small ε and Lan δ in order to prevent concentration of heating. Also.

Since the outer cylinder 19 receives heat from the upper stage row)vll through the core paper 8a, a material that also takes heat resistance into consideration is required. Therefore, in this embodiment, ceramics and heat-resistant resin are typically used for the outer cylinder 19, but the material is not particularly limited as long as it satisfies the above properties.

The single-sided corrugated pole with completed adhesion is conveyed to the next process through guide rolls 17.

By the way, when the load fluctuation 9 of the object to be heated changes, for example, the sheet speed, sheet width, amount of adhered glue, etc., the load fluctuation is detected by each of the aforementioned detection sensors or their substitute signals, and the oscillator 24 is necessary for this. It adjusts the output to perform heating under optimal conditions. To adjust this output, the relationship between the required output and the load of the object to be heated is programmed in advance in the oscillator 24, and the signals from each sensor are processed by the calculator 23, and the results are used in the settings described above. It is sufficient to adopt a system that automatically controls the output by comparing it with the value.

The following is an example of how to set the oscillator output E.

The load on the object to be heated is the corrugated pole sheet width 89, the amount of glue q attached to one corrugated top of the corrugated sheet, and the corrugated pitch P.
Since it is proportional to , the oscillator output E·■ needs to be increased or decreased accordingly. Also.

Since the required heating amount is proportional to V/L (operating speed V, heating length L), the heated object load constant C is defined as follows, and the 9 oscillator outputs E and I are adjusted in proportion to C.

Figure 5 shows the relationship graphically.

Next, FIG. 6 will be explained.

FIG. 6 shows another embodiment of the present invention, which differs from the embodiment shown in FIG. 1 in that the lower stage row tl12 is omitted. To explain its effect, 9-speed low/V
Core paper 8 is directly supplied between 11 and laminating row/L/13 and blown into nine rolls 11.11 to form a corrugated core paper 8a. That is, in the two embodiments, the bonding row #13 also serves as the lower corrugating roll 12 (FIG. 1) of the above embodiment. Thereafter, glue 7 is applied to the corrugated top portion of the corrugated ruled paper 8a by a gluing roller (v4) on the laminating roll 13, and the paper is laminated with a liner 9 that is separately fed. In the bonding section, the liner 9 and the corrugated paper 8a are pressed and brought into close contact with each other by the belt 14 whose pressing force is adjusted by the tensioner roll 15 as in the above embodiment. In the area where the corrugated paper 8a and the liner 9 are brought into close contact with each other under pressure by the belt 14, dielectric heating is performed in the same way as in the above embodiment, and the glue rapidly heats up to gel, completing the adhesion.

In addition, in two or more embodiments, the endless pel 1-1 is used as the pressurizing device.
Although a case has been described in which a part of the bonding row 4 surrounds a part of the circumferential surface of the bonding row/v13, other methods such as air pressure can also be used, and the present invention is not limited to the above embodiment.

Note that the output adjustment in response to load fluctuations of the heated object is the same as described above.

〔Effect of the invention〕

As described above in detail, the present invention provides the following excellent effects.

■ Vibration problems, such as noise and low material breakage, which were considered important problems in conventional single facers, are eliminated.

■ By adopting the dielectric heating method, it is possible to speed up the operation of the single facer, and at the same time it is possible to save the energy that would otherwise be used to heat up the paper, resulting in a large energy-saving effect.

■ By elucidating the causes of load fluctuations on the heated object and programmatically controlling the output of the oscillator based on these factors, it has become possible to optimally adjust the oscillator output in response to load fluctuations on the heated object. As a result, it goes without saying that the drying of corrugated cardboard sheets during normal manufacturing becomes more uniform, but even when the specifications of corrugated cardboard sheets change, it is possible to respond immediately and ensure proper drying. 9. Equalization and improvement of the quality of corrugated cardboard sheets is achieved.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention. Fig. 1 is a side sectional view, Fig. 2 is a view A of Fig. 1 showing the arrangement of electrodes, Figs. 3 and 4 are explanatory diagrams showing other examples of arrangement of electrodes, and Fig. 5 is the oscillator output. FIG. 6 is a side sectional view showing another embodiment of the present invention, and FIG. 7 is a side sectional view showing a conventional single facer. 8...Core i, 9...Liner, 11. 12...
- Corrugated roll. 13... Pasting roll, 14... Belt, 16...
...grip, lid i[m, 20...driving speed detection sensor, 21...seat width detection sensor, 22...
Glue amount detection sensor, 23... Arithmetic unit, 24... Oscillator

Claims (1)

[Claims] At least one corrugating roll that engages the corrugating paper to form corrugations; a laminating roll that meshes with the corrugating roll; gluing means for gluing the corrugated core paper that is transported along the outer periphery of the laminating roll; A pressure device consisting of a belt that presses the liner supplied over the stepped core paper onto the bonding roll surface, and is disposed on the back side of the liner and interposed between the liner and the stepped core paper. A dielectric heating device that heats the glue, a detection device that detects the operating speed, the amount of glue attached to the top of the corrugated core paper, and the sheet width, and an output adjustment device that adjusts the output of the dielectric heating device based on the signal from the detection device. A single facer characterized by having.