JPS62249731A - 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 (Field of Industrial Application) The present invention relates to a single phaser for producing single-sided corrugated cardboard sheets, which is a unit constituting a corrugator for producing corrugated cardboard.

(Prior art) As shown in FIG. 4, in a conventional single phaser, a core paper 8 is supplied to the upper roll L side, is caught in the meshing part of the upper roll L and the lower roll 2, and is formed into a wave shape. The core paper 8' becomes the core paper 8'.The core paper 8I is then transferred with 20 rotations of the lower roll, and the glue 7 in the glue container 6 is transferred to the glue roll 4. After that, the corrugated top part of the core paper 8' is pasted by the gluing roll 4.-The liner 9 supplied to the pressure roll 3 side and the pasted core paper 8' are pasted onto the lower roll 2 and the pressure roll 3. The paper is bonded at the pressurizing part to form a single-sided corrugated paperboard lO.

In the conventional single phaser described above, the upper roll 1 is generally pressed against the lower roll 2, and the pressure roll 3 is pressed against the lower roll 2 at a linear pressure of about 20 to 6 ok/cIrL. The former is a pressurizing force for performing tiering on the core paper 8, and the latter is a pressurizing force for providing adhesive force between the core paper 81 and the liner 9. Also.

The lower roll 2 has tooth-shaped corrugations machined on the outer surface of the roll along with the upper roll l, and the pressure roll 3 has a smooth surface. It has a structure in which it is struck at a high cycle through a core paper 8' and a liner 9 on the surface.

In the above structure, the upper roll 1, lower roll 2, and pressure roll 3 are mainly affected by [excitation change between lower roll 2 and pressure roll 3] x [contact spring constant between lower roll 2 and pressure roll 3]
(Due to the excitation force, the main components of the
It vibrates with 2 teeth.

When the excitation cycle N-Z matches the natural frequency of the roll system, resonance occurs, and the three rolls in particular vibrate violently. During such resonance, the pressure roll 3 and the lower roll 2 collide violently, and a large collision load is applied to the paper 5 8' and the liner 9 sandwiched between the rolls, causing the sheet to break or cause vibrations. Depending on the phase state of 5 paper 8' and liner 9
In addition, the phenomenon of not being laminated occurs, and in addition, large noise is generated. As mentioned above, sheet breakage due to roll vibration, poor lamination, and loud noise are important problems that require a single phaser solution. This is a challenge, especially with the increase in machine speed in recent years.

This problem is becoming more problematic as sheet quality deteriorates and paper becomes thinner.

From the above point of view, it is necessary to reduce vibrations generated in the rolls, etc., and reduce noise (a single phaser shown in FIGS. 6 and 7 has been proposed. In FIGS. 6 and 7, the pressure roll 3 A cylindrical core 14 is formed around the axis C, and a relatively thin (5 mm to 20 tm) cylindrical sleeve 13 is formed around the axial center C on the outer periphery of the cylindrical core I4. A gap is formed between the fitted cylindrical core 14 and the cylindrical sleeve 13. A low melting point metal 15 such as solder is sealed in the gap.The low melting point metal 15 is Pb. -8b-8 is common, but along with these contents, other Bi, In, Ag
By changing the content ratio of the above, it is possible to freely obtain a material having a melting point temperature between room temperature and about 320'C.

The reason why it is preferable that the cylindrical sleeve 13 is relatively thin is that when the impact force accompanying the rotation of the lower roll 2 is applied, the thinner the sleeve, the lower the rigidity.

This is because the effect of alleviating the impact force is produced. Further, the cylindrical core 14 has the role of maintaining bending rigidity as a roll. Furthermore, the low melting point metal 15 sealed in one gap is aimed at damping vibrations of the cylindrical sleeve 13. In a single phaser, heated steam is usually sealed in the hollow part of the pressure roll, and the outer surface of the pressure roll is heated to 160 to 220℃.
It is maintained at a certain level. This amount of heat is used to rapidly gel the liquid starch sugar, which is normally used when bonding the liner 9 and the paper 5 8I at the lower roll and pressure roll engagement portions, to obtain adhesive strength. Therefore, the low melting point metal 15 sealed in the gap is preferably an alloy solder containing tin or lead as a main component, which melts and becomes fluid during operation, has a vibration damping effect, and has good heat conductivity.

The teeth of the lower roll 2 are connected to the cylindrical sleeve 1 of the pressure roll 3'.
Since the cylindrical sleeve 13 has a relatively thin wall structure, the sleeve 13 acts elastically and provides a vibration damping effect. In other words, based on (the excitation displacement between the lower roll 2 and the pressure roll 3') x (the contact spring constant between the lower roll 2 and the pressure roll 3'), the vibration force is The excitation force becomes significantly smaller. Roll vibration is a response to this excitation force, so by reducing the root excitation force, the vibration during steady state and resonance can be significantly reduced. Furthermore, the cylindrical sleeve 13 and the cylindrical core 14
A low melting point metal 15 sealed in the gap between the two and turned into a fluid attenuates minute shell-like elastic vibrations due to impact due to viscous resistance caused by the flow.

Furthermore, a noise reduction effect occurs.

However, based on (excitation displacement between the lower roll 2 and pressure roll 3') x (contact spring constant between lower roll 2 and pressure roll 3'), 1 cylindrical sleeve 13, low melting point metal 15 One cylindrical core 14 is excited through the structure of this example, and since the wall thickness cannot be too thick from the viewpoint of heat conduction, the natural frequency of one cylindrical core 14 is low (because the single phasor operation There is a problem in that it resonates with the excitation cycle N-Z in the speed range, and an unexpectedly large noise is generated.

(Problems to be Solved by the Invention) In this way, the drawbacks of the pressure roll that has been generally applied to conventional single phasers can be improved. By using pressure rolls.

Based on roll shake-off (sheet cutting, poor lamination, etc. have been improved, resonance between the natural frequency of the cylindrical core and the excitation cycle still occurs within the operating range of the machine, resulting in unexpected loud noises. There was a problem that this occurred.

The present invention was proposed in view of this point, and its purpose is to significantly reduce the effective external force acting on the cylindrical core, and to reduce the natural frequency of the cylindrical core and the excitation cycle NZ at the operating speed. The purpose of the present invention is to provide a single knee that not only prevents resonance within the range and generates large noise, but also suppresses vibration when using a conventionally common pressure roll.

(Means for Solving the Problems) For this reason, 1 the present invention provides an upper roll and a lower roll for forming five sheets of paper in stages, a gluing device for gluing the five sheets formed in stages, and a pressure that presses against the lower roll. In a single phaser consisting of a roll, etc., an excitation cycle that is the same as the excitation cycle of the lower roll is applied to a point on the pressure roll that has a vibration mode with a different sign from the vibration mode of the pressure roll at the contact point of the lower roll. This is a solution to the above problem. (Function) The natural frequency of the shell of the cylindrical core and the excitation cycle N.2 resonate. In this case, the amplitude of the shell vibration of the cylindrical core is expressed by the following equation.

However, a: vibration amplitude, ψi = vibration mode fi at point i:
Excitation force applied to point i, m*: Effective mass.

ζ: Modal damping ω. : natural circular frequency, ω: excitation circular frequency The value tft in the equation (2) is the magnitude of the effective external force, and the present invention attempts to significantly reduce this effective external force.

Here, considering the circumferential secondary mode, it deforms as shown in FIG. 3, and since there is currently only one point of excitation, the effective external force at point A in FIG. 3 is as follows.

f=ψlfl Vinyl effective external force, ψI: vibration mode fI at excitation point A
: Excitation force at additional point A (excitation force due to the step pile of the lower roll) - In the unlikely event that point B is 90° away from point A in Figure 3 as in the present invention
When an excitation force of the same magnitude as f1 is applied with the same phase to f1, the effective external force f*' is given by the following equation.

f''=f, ψ1+f2ψ2=fl(ψ1+ψ2) Here, since the signs of the vibration mode ψ2 at point B and the vibration mode ψ2 at point A are different, f''' is significantly smaller than fo.

As mentioned above, since the effective external force f*' becomes significantly smaller,
The shell vibration of the cylindrical core is significantly reduced compared to formula (■), and the generation of loud noise can be suppressed.

These effects are also effective for ordinary pressure rolls.

(Example) An embodiment of the present invention shown in FIG. 1 will be described below.

This embodiment has a structure in which a vibrating corrugating roll 16, which has the same number of corrugations as the lower roll 2 and rotates at the same number of rotations as the lower roll 2, is pressed against the pressure roll 3'.

Here, as shown in FIG. 3, the cylindrical core 4 vibrates as a shell in a secondary mode in the circumferential direction, and the cylindrical sleeve 13 also vibrates as a shell in a secondary mode in the circumferential direction.
The additional state of the vibrating corrugated roll 16 is shown. In other words, in the direction perpendicular to the direction in which the excitation force is applied by the flutes of the lower roll 2 (hereinafter referred to as the nip direction), the 60th stage crest of the vibrating stage roll applies pressure at the same timing (in phase) as the 20th stage crest of the lower roll. A vibrating corrugated roll 16 is attached so as to strike the roll 3'.

Note that the number of ridges on the vibrating corrugated roll 16 does not necessarily have to be the same as the 20 tiers on the lower roll. The number of peaks may be the same as the number of peaks. In other words, the excitation cycles of both may be set to match.

FIG. 2 shows another embodiment. In this embodiment, an electromagnetic vibrator 17 is added in place of the vibrating corrugated roll 16 in a direction perpendicular to the nip direction, and the pressure roll 3' is vibrated in the same phase as the excitation force caused by the corrugated plate of the lower corrugated roll 2. It is designed to generate such electromagnetic excitation force.

These embodiments can be applied not only to the pressure roll 3' shown in FIGS. 1 and 2 but also to the conventional pressure roll 3 shown in FIGS. 4 and 5.

(Effects of the Invention) As explained in detail above, in the present invention, the excitation force and the action direction of the steps of the lower roll are perpendicular to the pressure roll, and the vibrations are in the same phase (same timing) and have the same magnitude. By applying an excitation force, the effective external force that causes the shell vibration of the cylindrical core in the circumferential secondary mode can be significantly reduced, and as a result, the natural vibration of the shell of the cylindrical core is suppressed, and the large-scale vibration caused by the shell vibration of the pressure roll is suppressed. Noise can be suppressed.

This is not limited to pressure rolls with a three-layer structure (the same effect can be expected for single-layer pressure rolls as well.

[Brief explanation of drawings]

1 and 2 are partial side sectional views of a single phasor that is an embodiment of the present invention, FIG. 3 is a diagram showing shell vibration modes (second order in the circumferential direction) of a cylindrical core such as a pressure roll, 4
The figure is a side sectional view of a conventional single phasor, and Figure 5 is a 4th phasor.
FIG. 6 is a partial side sectional view of another conventional single phaser, and FIG. 7 is a partially cutaway front view of FIG. 6. Explanation of the main parts of the diagram 2...Lower row/l/3.3'-
...Pressure roll 14...Cylindrical core 16.
... Vibration corrugated roll Fig. 1 Fig. 2 Fig. 4 Fig. 6

Claims (1)

[Claims] In a single phaser consisting of an upper roll and a lower roll that form the core paper into stages, a gluing device that glues the formed core paper, a pressure roll that presses against the lower roll, etc.,
A vibrator that vibrates a point on the pressure roll having a vibration mode with a different sign from the vibration mode of the pressure roll at a contact point of the lower roll with the same vibration cycle as the vibration cycle of the lower roll. A single facer characterized by arranging.