JPS6234761Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single facer for producing single-sided corrugated paperboard.

A conventional single facer will be explained in the first part and in FIG. 2. In the figure, 1 is the upper roll, 2 is the lower roll, 3 is the pressure roll, 4 is the glue roll, 5 is the doctor roll, 6 is the glue container, 7 is the glue, 8 is the core paper, and 8' is the corrugated core paper. , 9 is a liner, 10 is a single-sided corrugated paperboard, and 11 and 12 are bearings. The core paper 8 is supplied to the upper roll 1 side and is bitten into the meshing part of the upper roll 1 and the lower roll 2,
The core paper 8' is formed into a corrugated shape. Next, the core paper 8' is transferred as the lower roll 2 rotates, and the glue 7 in the glue container 6 is scooped up by the glue roll 4, and after the glue film is adjusted by the doctor roll 5, the glue 7 is transferred by the glue roll 4. Glue is applied to the top of the step of the core paper 8'. On the other hand, the liner 9 supplied to the pressure roll 3 side
The glued core paper 8' is adhered at the pressing portions of the lower corrugating roll 2 and the pressure roll 3 to form a single-sided corrugated paperboard 10.

In the single facer shown above, generally the upper roll 1 is connected to the lower roll 2, and the pressure roll 3
are pressed against the lower roll 2 at a linear pressure of about 20 to 60 kg/cm. The former is the pressure for forming corrugations on the core paper 8, and the latter is the pressure applied to the corrugated core paper 8' and the liner 9.
This is the pressing force to provide the adhesive force. In addition, the lower roll 2 has tooth-shaped corrugations pressurized on the outer surface of the roll together with the upper roll 1, while the pressure roll 3 has a smooth surface, so that the corrugations of the lower roll 2 do not change in the operating state. It has a structure in which the surface of the pressure roll 3 is struck at high cycles through a core paper 8' and a liner 9. In the above structure, upper roll 1,
The main components of the lower roll 2 and the pressure roll 3 are mainly affected by the excitation force 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]. Upper and lower rolls 1, 2
It vibrates with a tooth number cycle NZ (corrugated roll rotation speed N x number of teeth Z), and when the tooth number cycle NZ matches the natural frequency of the roll system, it resonates, and the three rolls in particular vibrate violently. During such resonance, the pressure roll 3 and the lower roll 2 collide violently, so that the core paper 8' and liner 9 sandwiched between the rolls
A large collision load is applied to the sheet, causing the sheet to break, or depending on the phase of the vibration, the core paper 8' and liner 9 may not be bonded together, and moreover, a large amount of noise may be generated.

As mentioned above, sheet breakage, poor lamination, and loud noise due to roll vibration are important issues that need to be solved for single facers, especially with the recent increase in machine speed.
This problem is becoming more problematic as sheet quality tends to deteriorate.

The present invention has been proposed in view of the above, and includes an upper roll and a lower roll for forming the core paper in stages, a gluing device for applying glue to the top of the step of the formed core paper, and a gluing device that is brought into contact with the lower roll to apply the glue. In a single facer equipped with a pressure roll that laminates a liner to a core paper and forms a single-sided corrugated sheet, the pressure roll is fitted into a cylindrical core and the outer periphery of the cylindrical core with a gap. It is characterized by being formed from a thin-walled cylindrical sleeve and granular material is enclosed in the gap, and the cylindrical sleeve forming the outer periphery of the pressure roll exhibits elastic behavior to buffer and reduce vibrations. At the same time, it is possible to provide a single facer in which the powder and granules sealed in the gap further dampen vibrations through dry friction, thereby significantly reducing generated noise and in which sheet cutting does not occur.

Hereinafter, the present invention will be explained in detail with reference to the illustrated embodiment shown in FIGS. 3 and 4. In the figure, 1 is an upper roll, 2 is a lower roll, 3' is a pressure roll, and 4 is a pressure roll.
is a glue roll, 5 is a doctor roll, 6 is a glue container,
7 is glue, 8 is core paper, 8' is stepped core paper, 9
10 is a liner, 10 is a single-sided corrugated paperboard, and 11 and 12 are bearings. The pressure roll 3' has a cylindrical core 14 formed around the axis C.
Similarly, there is a relatively thin wall (5 mm) around the axis C on the outer periphery of the
A cylindrical sleeve 13 with a diameter of 20 mm) is fitted, and a gap 16 is formed between the cylindrical core 14 and the cylindrical sleeve 13. The gap 16 is filled with powder particles 15 having good heat conductivity, such as steel balls of any shape. The reason why it is preferable that the cylindrical sleeve 13 is relatively thin is that when an impact force is applied due to the rotation of the lower roll 2, a thin wall has a small rigidity and is effective in alleviating the impact force. Further, the cylindrical core 14 has the role of maintaining bending rigidity as a roll. Further, the powder 15 sealed in the gap is intended to dampen vibrations of the cylindrical sleeve 13. In a single phaser, heated steam is usually sealed in the hollow part of the pressure roll.
The outer surface of the pressure roll is maintained at approximately 100 to 160°C. This amount of heat is used to rapidly gel the liquid starch glue that is normally used when bonding the liner 9 and the core 8' at the lower roll and pressure roll engagement portions to obtain adhesive strength. Therefore, the powder 15 sealed in the gap is preferably made of metal and has good thermal conductivity.

This embodiment is constructed as described above, and as in the conventional single facer, the upper roll 1, lower roll 2, and pressure roll 3' are pressed against each other and rotated to manufacture single-sided corrugated paperboard 10. . At this time, the teeth of the lower roll 2 are the pressure roll 3'
The mechanism is the same as that of the conventional single facer in that the cylindrical sleeve 13 is struck at high cycles through the core paper 8' and the liner 9. However, between the lower roll 2 and the pressure roll 3', which are the main sources of vibration, the cylindrical sleeve 13, which can have a relatively thin wall structure, acts elastically and provides a vibration damping effect. In other words, the excitation force 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') is the excitation force because the latter parameter becomes significantly smaller. becomes significantly smaller. Since the vibration of the roll is a response to this excitation force, by reducing the excitation force which is the root cause, the vibration during steady state and resonance can be significantly reduced, and the noise caused by the vibration can also be reduced. Furthermore, the cylindrical sleeve 1
The powder 15 enclosed in the gap 16 between the cylindrical core 14 and the cylindrical core 14 attenuates minute shell-like elastic vibrations due to impact due to dry friction at the contact area, further producing a noise reduction effect. FIG. 5 shows the results of a vibration test comparing the damping properties with and without the inclusion of the granular material 15. FIG. 5 shows the response due to vibration in terms of mobility, with solid lines and dotted lines showing before and after encapsulation, respectively. This result shows that significant vibration damping properties occur due to the action of the inclusions.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a conventional single facer, FIG. 2 is a partially cutaway front view of FIG. 1, and FIGS. 3 and 4 show an embodiment of the present invention. FIG. 1 is a partial side sectional view, FIG. 4 is a partially cutaway front view of FIG. 3, and FIG. 5 is a mobility diagram. 1...Upper roll, 2...Lower roll, 3,
3'... Pressure roll, 8... Core paper, 9... Liner, 10... Single-sided corrugated paper, 13... Cylindrical sleeve, 14... Cylindrical core, 15... Powder,
16... Gap.

Claims (1)

[Scope of utility model registration request] An upper roll and a lower roll that form the core paper into tiers, a gluing device that glues the top of the tier of the tiered core paper, and a liner that comes into contact with the lower roll and laminates the liner to the glued core paper to form one side. In a single facer equipped with a pressure roll for corrugated sheeting,
A single characterized in that the pressure roll is formed from a cylindrical core and a relatively thin cylindrical sleeve fitted with a gap around the outer periphery of the cylindrical core, and powder and granular material is sealed in the gap. Fuesa.