JPS59229333A - 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 The present invention relates to an improvement of a single facer, which is one unit of a corrugator, which is corrugated board manufacturing equipment.

A conventional general single facer is shown in its side cross section in Fig. 1 and its front view in Fig. 2. In these figures, ■ is an upper roll, 2 is a lower roll, 3 is a pressure roll, 4 is a roll with glue, 5 is a) "kukroll, 6 is a sub-container,
7 is glue, 8 is base paper, 8' is corrugated base paper, 9 is liner, 10 is one-sided corrugated sheet), 11.1.2.
13 indicates a bearing, respectively. First, to explain the manufacturing process of the single-faced corrugated sheet 10 using a single facer, the base paper 8 is fed to the upper roll 1 side, and it is caught in the meshing part of the double roll 1 and the lower roll 2, curled, and formed into a wavy shape. A sheet 8' is formed. Next, the step-formed base paper 8' is transferred as the lower roll 2 rotates, and the glue in the sub-container 6 is scooped up by the glue roll 4, and the glue film is adjusted by the dokuroll 5. , is glued to the top of the step of the base paper 8'.

Furthermore, the liner 9 supplied to the pressure roll 3 side and the pasted base paper 8' are adhered to each other at the pressing portions of the lower corrugated roll 2 and the pressure roll 3 to form a single-sided corrugated board sheet 10.

In the conventional single facer having the above structure, 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 20 to 50 kg/cm. The former is a pressing force for step-forming the base paper 8, and the latter is a pressing force for providing adhesive force between the base paper 8' and the liner 9. In addition, the lower roll 2 and the upper roll 1 have tooth-shaped corrugations on the outer surface of the roll, and the pressure roll 3 has a smooth surface. It has a structure that hits at a high cycle. Due to the above structure, the upper roll 1, the lower roll 2, and the pressure roll 3 mainly vibrate with the tooth number cycle of the upper and lower rolls 1.2 (corrugating roll rotation speed N x number of teeth Z), and the eigenvalue of the roll system When several cycles of NZ match, resonance occurs and the three rolls vibrate violently. During such resonance, the pressure roll 3 and the lower roll 2 collide violently, causing the base paper 8' sandwiched between the rolls to collide violently.
A large collision load is applied to the liner 9, causing the sheet to break or, depending on the phase of vibration, to poor bonding.

As mentioned above, sheet breakage, poor lamination, and loud noise caused by resonance are important problems with single facers.
This problem is becoming even more problematic due to the recent increase in machine speed and (3) deterioration of sheet quality. In the normal operating speed range of 0 to 300 m/rnm, many resonance points of various vibration modes appear, and usually about three occur (for example, 80 m/rnm).
m/: nms 130 m/mjn, 210 m/m
”).Resonance point C occurs at an operating speed where the tooth number cycle NZ matches the vibration eigenvalue of the roll system, depending on the mass, rigidity, etc. of each of the three rolls: upper roll 1, lower roll 2, and pressure roll 3. However, this eigenvalue can be raised or lowered by increasing or decreasing the diameter, wall thickness, etc. of each roll.
The conventional single facer structure has the disadvantage that it is impossible to eliminate the resonance point.

The present invention was proposed with the aim of solving the problems of sheet breakage and poor lamination at the resonance point of the conventional single facer. This invention was made from the viewpoint that it is sufficient to suppress vibration or prevent resonance points from occurring.

That is, the present invention provides a novel (4) mechanical structure that suppresses the vibration of a single facer and does not generate resonance points, and the novel points are as follows.
The structure is such that a pressure roll that presses a single facer pressure roll is arranged, and the pressure roll is pressed against the pressure roll near the resonance point when the pressure roll is not in contact with the pressure roll. The reason why such a configuration suppresses the vibration of the roll system of the single facer and does not generate a resonance point will be explained below with reference to FIG. 3.

Figure 3 shows the speed of the pressure roll 3 in a speed range of 100 to 160 m/:nin in a single facer (nominal surface length 2000 mm, upper roll lφ300, lower roll 2φ300, pressure roll 3φ300, pressure roll width 250 x 1500 U). Examples are shown in which the vibration amplitude of the shaft end was measured.A is the case when the pressure roll is in the same speed range and does not come into contact with the pressure roll 3 at all, and B is when the pressure roll is in the same speed range. All cases are when the pressure roll 3 is contacted and pressurized.

From the figure, it can be seen that when the pressure roll contacts and pressurizes the pressure roll 3, vibrations are significantly suppressed.

In addition, the position of the resonance point may be shifted, and the maximum speed of the machine may be reduced to 1.
If it is about 40 m/mi, it is possible to avoid the resonance point of 150 m/niq when the pressure roll 3 is pressed by the pressure roll. Here, we will explain why the resonance point shifts due to the pressure roll.

As mentioned above, the vibration eigenvalue of the roll system depends on the specifications of each roll, but by pressing the pressure roll against the pressure roll 3, the apparent rigidity of the pressure roll 3 increases. However, it is thought that the vibration eigenvalue of the roll system increased because the spring constant increased.

In the present invention, the pressure roll is brought into contact with and pressurized by the pressure roll 3 near the resonance point of the roll system of the single facer. When such an operation is performed, as shown by the broken line C in Figure 3, the distance from approximately 110 m 1 m1n (point P) to approximately 1
If the pressure roll is pressed in the mateno-operation region near 45 m/min (point Q), that is, in the vicinity of the resonance point, the resonance point can be avoided as shown by the broken line C in the entire operation region. The fact that resonance points do not occur in this manner eliminates the occurrence of phenomena such as sheet breakage, which is described above, and leads to improvements in machine performance and sheet quality.

That is, the present invention applies pressure (on) to the pressure roll only within the danger level (resonance point) based on the detection signal of the rotation speed of the rotating roll, and releases the pressure (off) outside the range. This is a characteristic feature. The control system will be as shown below.

Hereinafter, the present invention will be specifically explained with reference to embodiments shown in FIGS. 4 and 5.

In these figures, 1 is the upper roll, 2 is the lower roll, 3 is the pressure roll, 4 is the glue roll, 5 is the dokuroll, 6 is the glue container, 7 is the glue, 8 is the base paper, and 8' is the step formed. base paper,
9 is a liner, 10 is a single-sided corrugated sheet, 11.12.
Reference numeral 13 denotes a bearing, and the configuration, operation, and mutually related structure of each of these members is almost the same as that of the conventional single facer described above (equal parts are given the same reference numerals).

14 is disposed close to the pressure roll 3 and parallel to the axial direction of the pressure roll 3 in the vicinity of the resonance point of the roll system, and the shaft portions 14a at both ends are connected to a pair of left and right frames 16.
As shown in FIG. 5, a pressure roll is rotatably supported on a bearing 15 supported by a bearing 15 and is not displaceable in the axial direction. Reference numeral 16 denotes a rod 17 of a pressurizing device 17 using hydraulic cylinders attached to a pair of left and right fixed frames 18, respectively.
It is fixed to the tip of the pressurizing device 17, and is displaced by the synchronous expansion and contraction of the pressurizing device 17a, and is applied via the bearing 15 to the pressurizing row #1=l, which is fixed to the roll shell part of the roll 3. The pressure is applied to press the pressure roll 3 or to separate it from the roll shell portion of the pressure roll 3. 19 is a control device connected to each pressurizing device 17; 20 is a running speedometer connected to the control device 19;
The rods 17a of the pair of left and right pressure devices 17 are synchronously expanded and contracted via the control device 19, and when the rods 17a are extended, the pressure rollers 14ffi and pressure rolls are applied via the frame 16 and bearings 15. The pressure roll 14 is brought into contact with the roll shell portion of the pressure roll 3 under a predetermined pressure, and the pressure roll 14 is separated from the pressure roll 3 when the rod 17a is shortened. Note that 21 in the figure indicates a guide roll of the liner 9.

The single facer of the present invention is constructed as described above, and the base paper 8 passed between the upper roll 1 and the lower roll 2 becomes a step-formed base paper 8', and is transferred to the gluing roll 4. After being well pasted, it is laminated with a liner 9 between the pressure roll 3 and the lower roll 2 to obtain a single-sided corrugated sheet 10, which is the same as in the conventional single facer, but in this case, in the present invention, A pair of left and right pressurizing devices 17 are operated synchronously via a control device 19 that is activated by a signal from an operating speedometer 20, and the pressurizing roll 1 is activated near the resonance point of the roll system of the device.
4 is pressed against the pressure roll 3 with a predetermined contact pressure. Therefore, as mentioned earlier, as shown by the broken line C in Figure 3,
The occurrence of resonance points in the roll system is avoided, there is no risk of sheet breakage, and the machine performance and sheet quality are improved.

Since the single facer of the present invention has the above-described configuration and operation, the present invention has the practical effect of eliminating the drawbacks of the conventional single facer described above.

Next, another embodiment of the present invention shown in FIG.
4. In an example in which a plurality of rollers (two in the illustrated example) are arranged along the circumferential direction of the pressure roll 3, and still another embodiment of the present invention shown in FIG. An example is shown in which a plurality of pressure rolls 14 (three in the illustrated example) are arranged.

The arrangement and number of the pressure rolls 14 may be modified in various ways as shown in these examples, but the role of the pressure rolls 14 is to regulate the vibrations of the pressure rolls 3. Since deflection vibration is the main component, the load is received the most at the axial center of the pressure roll 3. Therefore, if one pressure roll 14 with a width equal to or less than the roll shell width of the pressure roll 3 is arranged, the normal However, if the vibration of the roll system of a single facer is very large, it is possible to limit the vibration by using the pressure roll 14 at multiple points on the outer periphery of the pressure roll 3, as shown in FIG. In addition, when manufacturing a wide variety of single-sided corrugated cardboard sheets, ranging from high quality to low quality, the state of vibration may change depending on the sheet being manufactured, so if the vibration is small, Only the central pressure roll 14 may be operated, and if the vibration is large, the left and right pressure rolls 14 may also be operated at the same time.

Furthermore, the pressure roll 14 is provided with a crown, and the pressure roll 3 is kept under low pressure during normal operation.
The pressing force may be increased near the resonance point of the roll system. In this case, since the rigidity of the pressure roll 3 can be changed almost proportionally by the pressing force of the pressure roll 14, the same effect as described above can be achieved.

[Brief explanation of the drawing]

1 and 2 are schematic explanatory diagrams of a conventional single facer, in which FIG. 1 is a longitudinal cross-sectional view, and FIG. Fig. 3 is a diagram for explaining why the single facer of the present invention regulates roll system vibration and does not generate resonance points, and Figs. 4 and 5 are schematic diagrams of one embodiment of the present invention. In the explanatory drawings, Fig. 4 is a longitudinal sectional view, Fig. 5 is a view taken along the Y, -, and Y lines of Fig. 4 with some parts (base paper and single-sided corrugated sheet) omitted, and Figs. FIG. 7 is a diagram showing other examples of arrangement of pressure rolls. In Figures 3 to 7, 1: 2-stage roll, 2: lower roll, 3: pressure roll, 4: gluing roll, 8: base paper, 8' base paper formed in two stages, 9: liner , 10: Single-sided cardboard sheet,
11.12.13: Bearing, 14: Pressure roll, 14a
: Both end shaft parts of the pressure roll, 15: Bearing, 16: Frame, 17: Pressure device (hydraulic cylinder), 17a: Rotsu 1-'', 18: Fixed frame, 19: Control device, 20:
Driving speedometer, 21 nigaite 80 l. () 1 m to - (N

Claims (1)

[Claims] "Two-stage roll, lower stage roll, glue roll, pressure port and roll shell part 2 of the above-mentioned pressure 'jE roll, in a single facer that is pressed by a pressure roll that is pressed with a predetermined pressure contact force by a pressure device. , the single facer is characterized in that the pressure roll is controlled to be pressurized only in the rotation speed range near the resonance point set in advance, based on the rotation speed detection signal of the pressure port. .